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Chapters 9 & 10.  Description: covers forehead and dome of skull – no boney attachments  Origin: galea aponeurotica  Insertion: skin of the eyebrows,

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Presentation on theme: "Chapters 9 & 10.  Description: covers forehead and dome of skull – no boney attachments  Origin: galea aponeurotica  Insertion: skin of the eyebrows,"— Presentation transcript:

1 Chapters 9 & 10

2  Description: covers forehead and dome of skull – no boney attachments  Origin: galea aponeurotica  Insertion: skin of the eyebrows, root of nose  Action: raises eyebrows wrinkles forehead skin horizontally


4  Description: overlies posterior occiput; be pulling on the galea, fixes origin of frontalis  Origin: occipital and temporal bones  Insertion: galea aponeurotica  Action: fixes aponeurosis and pulls scalp posteriorly

5  Description: fan-shaped muscle that covers part of the temporal, frontal and parietal bones  Origin: temporal fossa  Insertion: coronoid process of mandible via tendon  Action: Closes jaw, elevates and retract mandible, maintains jaw position at rest

6  Description: thin, tripartite sphincter muscle of eyelid, surround rim of orbit  Origin: frontal and maxillary bones and ligaments around orbit  Insertion: tissue of eyelid  Action: protects eye from intense light and injury, blinking, squinting, draws eyebrows inferiorly

7  Description: Powerful muscle that covers lateral aspect of mandibular ramus  Origin: zygomatic arch and maxilla  Insertion: angle of ramus of mandible  Action: prime mover of jaw closers: elevates mandible

8  Description: muscle pair extending diagonally from cheekbone to corner of mouth  Origin: zygomatic bone  Insertion: skin and muscle at corner of mouth  Action: raises lateral corners of mouth upward (smiling muscle)

9  Description: Complicated multilayered muscle of the lips with fibers that run in many different directions (most run circularly)  Origin: indirectly from maxilla and mandible, fibers blend with fibers of other facial muscles  Insertion: encircles mouth  Action: closes lips, purses and protrudes lips (kissing and whistling muscle)

10  Description: Unpaired, thin sheet-like superficial neck muscle, plays a role in facial expression  Origin: fascia of chest (over pectoral and deltoid)  Insertion: lower margin of mandible and skin at corner of mouth  Action: downward sag of mouth, tenses skin of neck for shaving


12  Description: most medial muscle of the neck: thin, superficial except inferiorly, where cover by the sternocleidomastoid  Origin: manubrium and medial end of clavicle  Insertion: lower margin of hyoid bone  Action: depresses larynx and hyoid bone if mandible is fixed may also flex skull

13  Description: two-headed muscle loacted deep to the platysma on anterolateral surface of neck  Origin: manubrium and medial portion of clavicle  Insertion: mastoid process of temporal bone  Action: primer mover of head flexion; actin g alone can rotate head toward shoulder on opposite side, tilts head laterally


15  Description: Flat, thin muscle directly beneath and obscured by pectoralis major  Origin: anterior surface of ribs 3-5 or (2-4)  Insertion: coracoid process of scapula  Action: With ribs fixed, draws scapula forward and downward, with scapula fixed draws rib cage superiorly

16  Description: large, fan-shaped muscle covering upper portion of chest, divided into clavicular and sternal parts  Origin: sternal end of clavicle, cartilage of ribs 1-6 (or 7) and aponeurosis of external oblique  Insertion: greater tubercle of humerus  Action: prime mover of arm flexion, rotates arm medially, assist in climbing, throwing, pushing and forced inspiration


18  Description: fan-shaped muscle; lies deep to the scapula, beneath and inferior to pectoral muscles on lateral rib cage  Origin: ribs 1-8 (or 9)  Insertion: entire anterior surface of vertebral border of scapula  Action: prime mover to protract and hold scapula against chest wall; abduction and raising arm, pushing punching (boxer’s muscle)


20  Description: partially covered by deltoid and trapezius, named for its scapular location: rotator cuff muscle  Origin: infraspinatus fossa of scapula  Insertion: greater tubercle of humerus posterior to supraspinatus  Action: helps to hold the head of humerus in the glenoid cavity, stabilizing the joint,rotates humerus laterally


22  Description: Thick, rounded muscle located inferior to teres minor  Origin: postrior surface of scapula at inferior angle  Insertion: intertubercular sulcus of humerus; insertion tendon is fused with latisimus dorsi  Action: posteromedially extends, medially rotates and adducts humerus; synergist of lats

23  Description: two rectangular muscles lying deep to the trapezius and inferior to levator scapulae  Origin: spinous processes of C 7 and T 5  Insertion: medial border of scapula  Action: retract scapula “squaring the shoulders” rotate glenoid cavity of scapula downward (paddling a canoe) stabilizing shoulder

24  Description: broad, flat, triangular muscle of low back  Origin: indirect attachment via lumbodorsal fascia into spines of lower 6 thoracic vertebrae, lumbar vertebrae and lower 3-4 ribs, iliac crest  Insertion: spirals around teres major to insert in floor of intertubercular sulcus of humerus  Action: primer mover of arm extension, arm adduction, medially rotates arm at shoulder

25  Description: (external)11 pairs lie between ribs, fibers run obliquely down and forward from rib to rib (internal)11 pairs, run deep and to right angles of external fibers  Origins: (external) inferior border of rib above (internal) superior border of rib below  Insertions: (external) superior border of rib below, (internal) inferior border of rib above  Actions: (external)aid in inspiration, (internal) aid in expiration


27  Description: medial superficial muscle pair extend from pubis to rib cage, segmented 3 sections  Origin: pubic crest and symphysis  Insertion: xiphoid process and costal cartilage  Action: flex and rotate lumbar region of vertebral column used in sit-ups and curls


29  Description: largest and most superficial of three lateral muscles, fibers run downward and medially  Origin: fleshy strips from outer surface of lower 8 ribs  Insertion: fibers insert into linea alba, pubic crest and tubercle, and iliac crest  Action: aid in flexing vertebral column, trunk rotation and lateral flexion, used in oblique curls

30  Description: most fibers run upward and medially, fans so some run down and medially  Origin: lumbar fascia, iliac crest, and inguinal ligament  Insertion: linea alba, pubic crest, last 3-4 ribs  Action: same as external oblique

31  Description: deepest muscle of abdominal wall, fiber run horizontally  Origin: inguinal ligament, lumbar fascia, cartilage of last 6 ribs  Insertion: linea alba, pubic crest  Action: compresses abdominal contents


33  Description: thick, multi-pennate muscle forming rounded shoulder muscle mass  Origin: embraces insertion of trapezius; lateral third of clavicle, acromion and spine of scapula  Insertion: deltoid tuberosity of humerus  Action: primer mover of arm abduction

34  Description: large fleshy muscle of posterior compartment of arm, 3 headed origin  Origin: long head: infraglenoid tubercle of scapula, lateral head: posterior shaft of humerus, medial head: posterior radial shaft distal to radial groove  Insertion: common tendon to olecranon process of ulna  Action: prime mover forearm extensor

35  Description: 2 headed fusiform muscle, bellies unite as approaching insertion  Origin: short head: corocoid process, long head: tubercle above the lip of glenoid cavity  Insertion: by common tendon to radial tuberosity  Action: flexes elbow joint and supinates forearm


37  Description: strong muscle that is immediately deep to biceps on distal humerus  Origin: front of distal humerus; embraces insertion of deltoid  Insertion: coronoid process of ulna  Action: major forearm flexor (lifts ulna as biceps lift radius)

38  Description: 2 headed muscle seen in superficial view between brachioradialis and flexor carpi radialis  Origin: medial epicondyle of humerus, coronoid process of ulna  Insertion: by common tendon to lateral radius, midshaft  Action: pronates forearm, weak flexor of elbow

39  Description: superficial muscle of lateral forearm, extend from distal humerus to distal forearm  Origin: lateral supercondylar ridge at distal end of humerus  Insertion: base of styloid process of radius  Action: synergist in forearm flexion

40  Description: Parallels brachioradialis on lateral forearm, and may blend with it  Origin: lateral supercondylar ridge of humerus  Insertion: base of 2 nd metacarpal  Action: extends wrist in conjunction with extensor carpi ulnaris and abducts wrist in conjunction with flexor carpi radialis

41  Description: runs diagonally across forearm, midway its fleshy belly is replaced by a flat tendon  Origin: medial epicondyle of humerus  Insertion: base of 2 nd and 3 rd metacarpals  Action: powerful flexor of wrist, abducts hand

42  Description: most medial of superficial posterior muscles; long slender muscle  Origin: lateral condyle of humerus and posterior border of ulna  Insertion: base of 5 th metacarpal  Action: Extends wrist in conjunction with the extensor carpi radialis and adducts wrist in conjunctions with flexor carpi ulnaris

43  Description: small fleshy muscle with a long insertion tendon  Origin: medial epicondyle of humerus  Insertion: palmar aponeurosis; skin and fascia of palm  Action: weak wrist flexor; tenses skin and fascia of palm during hand movement

44  Description: lies medial to extensor carpi radialis brevis; a detached portion of this muscle, called extensor digiti minimi, extends the little finger  Origin: lateral epicondyle of humerus  Insertion: by four tendons into distal phalanges 2-5  Action: prime mover of finger extension; extends wrist, can abduct (flare) fingers


46  Description: is a composite of two closely related muscles  Iliacus: large fan-shaped muscle (more lateral) origin: iliac fossa, crest, lateral sacrum  Psoas major: longer thicker more medial muscle (tenderlion) origin: transverse process, disks, bodies of L 1-5 and T 12  Insertion: lesser trochanter of femur  Action: prime mover of flexing thigh and trunk (bowing)

47  Description: Short, flat muscle; overlies adductor brevis on proximal thigh  Origin: pectineal line of pubis  Insertion: inferior from lesser trochanter to linea aspera of posterior femur  Action: adducts, flexes, and medially rotates thigh

48  Description: enclosed between fascia layers of anterolateral aspect of thigh, associated with medial rotators and flexors of thigh  Origin: anterior aspect of iliac crest and anterior superior iliac spine  Insertion: iliotibial tract  Action: flexes and abducts thigh, rotates thigh medially; steadies the knee and trunk on thigh by tensing iliotibial tract

49  Description: Strap-like, superficial muscle running obliquely across anterior surface of thigh to knee, longest muscle in the body; crosses both hip and knee  Origin: anterior superior iliac spine  Insertion: winds around medial aspect of knee into medial aspect of tibia  Action: flexes, abducts and laterally rotates thigh, weak flexor of knee, “tailors muscle”

50  Description: overlies middle aspect of adductor magnus, most anterior of adductor muscles  Origin: pubis, near pubic symphysis  Insertion: linea aspera  Action: adducts, flexes and medially rotates thigh

51  Description: long, thin, superficial muscle of medial thigh  Origin: inferior ramus and body of pubis and ischial ramus  Insertion: medial surface of tibia, just inferior to its medial condyle  Action: adducts thigh, flexes and medially rotates thigh, especially during walking, flexes knee


53  Description: superficial muscle of anterior thigh, runs straight down thigh, longest head and only muscle of group to cross the hip  Origin: anterior inferior iliac spine and superior margin of acetabulum  Insertion: patela and tibial tuberosity via the patellar ligament  Action: extends knee and flexes thigh at hip

54  Description: largest head of the group, forms lateral aspect of thigh, common intramuscular injection site  Origin: greater trochanter, linea aspera  Insertion: patella and tibial tuberosity  Action: extends and stabilizes knee

55  Description: forms inferomedial aspect of thigh  Origin: linea aspera, intertrochanteric line  Insertion: Patella, and tibial tuburosity  Action: extends knee; inferior fibers stabilize patella


57  Description: The iliotibial tract, also known as the iliotibial band, is a thick strip of connective tissue connecting several muscles in the lateral thigh.  Origin: arises at its proximal end from the tendons of the tensor fasciae latae and gluteus maximus muscles.  Insertion: inserting on the lateral epicondyle of the tibia  Action: It also allows the tensor fascia latae and gluteus maximus muscles to support the extension of the knee while standing, walking, running and biking.

58  Description: thick muscle largely covered by gluteus maximus, site for intramuscular injection  Origin: between anterior and posterior gleteal lines on lateral surface of ilium  Insertion: lateral aspect of greater trochanter  Action: abduct and medially rotates thigh, steadies pelvis, its action is extremely important in walking

59  Description: largest and most superficial muscle, forms bulk of buttock mass  Origin: dorsal ilium, sacrum, coccyx  Insertion: gluteal tuberosity of femur, iliotibial tract  Action: major extensor of thigh, complex, powerful, and most effective when thigh is flexed and force is necessary


61  Description: a triangular muscle with broad insertion, is a composite muscle that is part adductor and part hamstring in action  Origin: ischial and pubic rami and ischial tuberosity  Insertion: linea aspera and adductor tubercle of femur  Action: anterior part adducts and medially rotates thigh, posterior part is synergist to hamstrings in thigh extension

62  Description: most lateral muscle of group, arises from two heads  Origin: ischial tuberosity, linea aspera, and distal femur  Insertion: head of fibula and lateral condyle of tibia  Action: Extends thigh and flexes knee, laterally rotates leg, especially when knee is flexed

63  Description: lies medial to bicep femoris, it is quite fleshy, long slender tendon begins about 2/3 of way down thigh  Origin: ischial tuberosity  Insertion: medial aspect of upper tibial shaft  Action: Extends thigh at hip, flexes knee, with semimembranosus, medially rotates leg

64  Description: Deep to the semitendinosis  Origin: ischial tuberosity  Insertion: medial condyle of tibia, via oblique popliteal ligament to lateral condyle of femur  Action: extends thigh and flexes knee; medially rotates leg


66  Description: superficial muscle of pair, two prominent bellies that form proximal curve of calf  Origin: by two heads from medial and lateral condyles of femur  Insertion: posterior calcaneus via calcaneal tendon  Action: plantar flexes foot when knee is extended, It crosses the knee so it can flex the knee when foot is dorsiflexed

67  Description: broad, flat muscle, deep to the gastrocnemius on posterior surface of calf  Origin: extensive origin from superior tibia, fibula, and interosseous membrane  Insertion: posterior calcaneus via calcaneal tendon  Action: plantar flexes foot; important locomotor and postural muscle during walking, running and dancing

68  Description: superficial lateral muscle; overlies fibula  Origin: upper portion of lateral fibula  Insertion: by long tendon that curves under foot to first metatarsal and medial cuneiform  Action: plantar flexes and everts foot; may help keep foot flat on ground


70  Description: the tendon from the gastrocnemius muscle

71  Description: unipennate muscle on anterolateral surface of leg; lateral to tibialis anterior  Origin: lateral condyle of tibia, proximal ¾ of fibula, interosseous membrane  Insertion: middle and distal phalanges of toes 2-5  Action: prime mover of toe extension ( acts mainly at metatarsophalangeal joints), dorsiflexes foot

72  Description: superficial muscle of anterior leg; laterally parallels sharp anterior margin of tibia  Origin: lateral condyle of upper 2/3 of tibial shaft; interosseous membrane  Insertion: inferior surface of medial cuneiform and first metatarsal  Action: prime mover of dorsiflexion; inverts foot, assists in supporting medial longitudinal arch


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