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 Frontalis ◦ O: Frontal Bone ◦ I: eyebrow skin ◦ Action: elevates eyebrows.

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Presentation on theme: " Frontalis ◦ O: Frontal Bone ◦ I: eyebrow skin ◦ Action: elevates eyebrows."— Presentation transcript:

1  Frontalis ◦ O: Frontal Bone ◦ I: eyebrow skin ◦ Action: elevates eyebrows

2  Orbicularis oculi ◦ Sphincter muscle of eyelid ◦ O: frontal & maxillary bones ◦ I: tissue of eyelid ◦ Action: closes eye ◦ Nerve: facial / CN VII (11.6)

3  Orbicularis oris ◦ Sphincter muscle around mouth ◦ O: Maxilla; mandible ◦ I: skin around mouth ◦ Action: closes/ protrudes lips

4  Zygomaticus ◦ O: zygomatic bone ◦ I: corners of mouth ◦ Action: smiling ◦ Nerve: facial / CN VII (11.6) Major and Minor

5  Platysma ◦ Broad plate-like muscle ◦ O: chest fascia ◦ I: mandible; skin at corners of mouth ◦ Action: depresses mandible, pulls lower lip down

6  Masseter ◦ O: zygomatic arch ◦ I: angle & ramus of mandible ◦ Action: elevate mandible ◦ Nerve: trigeminal nerve / CN V (foramen ovale) (11.7a) Masseter

7  Temporalis ◦ O: temporal fossa ◦ I: coronoid process of mandible ◦ Action: elevate and retract mandible ◦ Nerve: trigeminal n. / CN V (11.7a)

8  Buccinator ◦ O: molar area of mandible/ maxilla ◦ I: orbicularis oris ◦ Action: compresses cheek

9  Sternocleidomastoid ◦ O: manubrium & medial clavicle ◦ I: mastoid process of temporal bone ◦ Action: head & neck flexion, rotate head contralaterally ◦ Nerve: accessory n. / CN XI (11.8a)

10  Sternocleidomastoid

11  Styloglossus ◦ O: styloid process of temporal bone ◦ I: tongue ◦ Action: retract & elevate tongue ◦ Nerve: hypoglossal n. / CN XII (11.7c) Styloglossus

12  Hyoglossus ◦ O: hyoid bone ◦ I: tongue ◦ Action: depresses tongue ◦ Nerve: hypoglossal n. / CN XII (11.7c) Hyoid bone

13  Digastric ◦ two muscle bellies with an intermediate tendon attached to the hyoid bone ◦ O: inferior margin of mandible (anterior belly); mastoid process of temporal bone (posterior belly) ◦ I: hyoid bone ◦ Action: elevate hyoid, stabilize hyoid, depress mandible ◦ Nerve: trigeminal n. / CN V (anterior belly), facial n. / CN VII (posterior belly) (11.8a) Anterior belly Posterior belly

14  Stylohyoid ◦ O: styloid process of temporal bone ◦ I: hyoid bone ◦ Action: elevate & retract hyoid, swallow ◦ Nerve: facial n. / CN VII (11.7c) Stylohyoid

15  Sternohyoid ◦ O: manubrium & medial end of clavicle ◦ I: hyoid bone ◦ Action: depress hyoid (11.8a) Sternohyoid

16  Pharyngeal constrictors ◦ O: mandible, pterygoid process, hyoid, laryngeal cartilages ◦ I: posterior medial raphe of pharynx ◦ Action: peristaltic contraction / swallow (11.8b) Superior Middle Inferior

17  Gluteus muscles ◦ Maximus  O: post. Ilium/ sacrum; I: gluteal tuberosity  Action: thigh extension; ext. rotation; abduction ◦ Medius  O: post. Ilium; I: gluteal tuberosity  Action: thigh abduction ◦ Minimus (deep)  O: post. Ilium; I: gluteal tuberosity  Action: thigh abduction

18 Gluteus muscles ◦ Minimus (deep)  O: post. Ilium; I: gluteal tuberosity  Action: thigh abduction Hip & knee muscles

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20 Adductors – O: Ischium/ pubis – I: femur – Action: adduct thigh Sartorius – O: ant. Iliac crest – I: medial tibial tuberosity – Action: thigh flexion; abduction; ext. rotation

21 Hip & knee muscles Tensor fasciae latae – O: Iliac crest – I: lateral condyle tibia – Action: thigh abduction Iliopsoas – O: ilium – I: lesser trochanter – Action: thigh flexion (P.M.) Gracilis – O: pubis; I: prox. medial tibia – Action: adduct thigh

22  Quadriceps femoris ◦ O: Proximal femur ◦ I: tibial tuberosity via patellar tendon ◦ Action: extend knee, flex thigh

23  Quadriceps femoris ◦ O: Proximal femur ◦ I: tibial tuberosity via patellar tendon ◦ Action: extend knee, flex thigh Vastus lateralis Vastus intermedius Vastus medialis Patella Patellar ligament Rectus femoris tendon (cut)

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25  Hamstrings ◦ O: ischial tuberosity ◦ I: posterior proximal tibia ◦ Action: extend thigh, flex knee

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27  Tibialis anterior ◦ O: lateral condyle and shaft of tibia ◦ I: tarsal and first metatarsal bones ◦ Action: dorsiflexion  Extensor digitorum longus ◦ O: lat. Condyle tibia; I: phalanges 2-5 ◦ Action: extends toes, dorsiflexion

28  Gastrocnemius ◦ O: medial & lateral condyles of femur ◦ I: calcaneus via Achilles tendon ◦ Action: plantar flexion, flex knee  Soleus ◦ plantar flexion  Fibularis ◦ plantar flexion, eversion

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31  Spinalis ◦ O: spines of upper lumbar and lower thoracic vertebrae ◦ I: spines of upper thoracic and cervical vertebrae ◦ Action: extends vertebral column (11.9d)

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33  External & internal intercostals ◦ O&I: inferior & superior border of ribs ◦ Action: inspiration and expiration (11.10a) Internal

34  Diaphragm ◦ O: xiphoid process, ribs 10-12, lumbar vertebrae ◦ I: central tendon ◦ Action: flattens on contraction (inspiration) ◦ Nerve: phrenic nerves (11.10b) Xiphoid process

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36  Rectus abdominis ◦ O: pubic crest & symphysis ◦ I: xiphoid process and costal cartilages of ribs 5- 7 ◦ Action: flex & rotate lumbar vertebrae, stabilize pelvis during walking, increase intraabdominal pressure ◦ Note: 3 tendinous insertions, aponeurosis & linea alba (11.11ab)

37  Oblique ◦ Internal ◦ external  Transverse

38  Trapezius ◦ O: occipital bone, C7- T12 spinous processes ◦ I: acromion, spine of scapula, lateral 1/3 of clavicle ◦ Action: elevate, adduct, depress scapula, extend head (11.13b) POSTERIOR VIEW

39  Latissimus dorsi ◦ O: Fascia spines T7- L5 ◦ I: intertuburcular groove humerus ◦ Action: PM arm extension, adduction arm

40  Rhomboid ◦ O: spinous process C7- T5 ◦ I: medial scapula ◦ Action: adduct scapula  Levator scapulae ◦ O: Transverse process C1-C4 ◦ I: medial border scapula ◦ Action: elevate scapula

41  Deltoid ◦ O: lateral clavicle, acromion & spine of scapula ◦ I: deltoid tuberosity of humerus ◦ Action: arm- abduction, flexion, extension, medial & lateral rotation (11.13ab) Anterior Posterior

42  Teres major  O: medial inferior scapula  I: intertuburcular groove humerus (ant. side)  Action: medial arm rotation, adducts arm Shoulder muscles

43  Act to stabilize head of humerus in glenoid cavity and prevent dislocation  S.I.T.S. ◦ Supraspinatous ◦ Infraspinatus  ◦ Teres minor ◦ Subscapularis

44  Infraspinatus ◦ O: infraspinous fossa ◦ I: greater tubercle of humerus ◦ Action: lateral rotate humerus  Teres minor ◦ O: inf. lat. Border scapula ◦ I: greater tubercle ◦ Action: lateral rotate humerus (11.14b) POSTERIOR VIEW

45  Supraspinatus ◦ O: Supraspinous fossa ◦ I: greater tubercle ◦ Action: abduction humerus POSTERIOR VIEW

46  Subscapularis ◦ O: subscapular fossa ◦ I: lesser tubercle of humerus ◦ Action: medial rotate arm ANTERIOR VIEW

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49  Pectoralis major ◦ O: medial clavicle, sternum, cartilage of ribs 1-6 ◦ I: intertubucular groove humerus ◦ Action: arm-flexion, medial rotation, adduction (11.13a) -Nerve: Medial and lateral pectoral nerves (C6-C8)

50  Pectoralis minor ◦ O: anterior surface of ribs 3-5 ◦ I: coracoid process of scapula ◦ Action: with ribs fixed, pulls scapula anterior & inferior; with scapula fixed, pulls ribs superiorly ◦ Nerve: Medial and lateral pectoral nerves (C6-C8) (11.13a)

51  Triceps brachii ◦ O: long head- infraglenoid tubercle, lat. & med. heads-posterior shaft of humerus ◦ I: olecranon process of ulna ◦ Action: extend forearm, assist adduction of arm ◦ Nerve: Radial nerve (11.14b)

52  Biceps brachii ◦ O: short head-coracoid process, long head-tubercle above glenoid cavity and lip of glenoid cavity (intertubercular groove) ◦ I: radial tuberosity ◦ Action: flex elbow, supinate forearm, weak arm flexor ◦ Nerve: Musculocutaneous nerve (C5 & C6) (11.14c)

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54  Serratus anterior ◦ O: ribs 1-9 ◦ I: medial border of scapula ◦ Action: hold scapula against chest wall, moves inferior angle of scapula lateral & superior (abduction, pushing, punching) (11.13a,8.1a reversed)

55 Superficial thorax muscles

56  Flexor carpi (radialis & ulnaris) ◦ O: medial epicondyle of humerus, ulna ◦ I: metacarpals and carpals ◦ Action: wrist flexion, abduct & adduct hand ◦ Carpal tunnel (Median nerve) syndrome p. 184 (11.15a) Anterior view radialis ulnaris

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58  Extensor carpi ◦ O: lateral epicondyle of humerus ◦ I: base of metacarpals ◦ Action: extend, abduct, and adducts wrist ◦ Palpate forearm muscles

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