Presentation is loading. Please wait.

Presentation is loading. Please wait.

Ex. 12: Skeletal Muscle 1. A. Characteristics of Three Muscle Types 2.

Similar presentations


Presentation on theme: "Ex. 12: Skeletal Muscle 1. A. Characteristics of Three Muscle Types 2."— Presentation transcript:

1 Ex. 12: Skeletal Muscle 1

2 A. Characteristics of Three Muscle Types 2

3 1. Skeletal muscle – with striations; each skeletal muscle cell (fiber) has multiple and peripherally located nuclei 3

4 StriationsMuscle fiber (b) (a) Nuclei Location– primarily to bones by tendons 4

5 2. Cardiac muscle –striations; each muscle cell (fiber) has a single centrally located nucleus, branches, and intercalated discs at both ends 5

6 Location– the heart 6

7 3. Smooth muscle – without striations; each cell (fiber), with a single and centrally located nucleus, is thick in the middle and tapered at each end 7

8 Muscle cellsNuclei (b) (a) Location– walls of viscera, airways, blood vessels, iris and ciliary body of eye 8

9 B. The Organization of Skeletal Muscle 9

10 10 A B C

11 11

12 12

13 13

14 C. The Neuromuscular Junction 14

15 Skeletal muscle fibers Neuromuscular junction Motor neuron 2 Spinal cord Motor neuron 1 The number of muscle fibers controlled by one neuron is called a motor unit. 15

16         Neurotransmitter 16

17 Ex. 13: Gross Anatomy of the Muscular System 17 Required muscles/tendons are highlighted in green, the same 80 muscles and 3 tendons appeared in the lab manual. When highlighted in red, muscles’ actions, insertions, and origins are also required.

18 Frontalis Galea aponeurotica Orbicularis oculi Platysma Anterior view Mentalis (cut) Orbicularis oris Masseter Zygomaticus minor Levator labii superioris Zygomaticus major Risorius Depressor anguli oris Depressor labii inferioris Nasalis Corrugator supercilii Buccinator Modiolus Levator anguli oris SuperficialDeep 18

19 Temporalis Frontalis (cut) Galea aponeurotica Orbicularis oculi Sternohyoid Orbicularis oris Occipitalis Omohyoid Sternothyroid Inferior pharyngeal constrictor Sternocleidomastoid Masseter Thyrohyoid Zygomatic arch Levator labii superioris Zygomaticus minor Zygomaticus major Depressor labii inferioris Depressor anguli oris Buccinator Risorius (cut) Nasalis Corrugator supercilii Mentalis Levator scapulae Lateral view Modiolus 19 O: Zygomatic arch & maxilla; I: Mandibular angle & ramus Action: Closes jaw & elevates mandible

20 Galea aponeurotica Inferior pharyngeal constrictor Thyrohyoid Zygomatic arch Levator labii superioris Depressor labii inferioris Depressor anguli oris Nasalis Corrugator supercilii Levator scapulae Lateral view Modiolus 20 Origin: Insertion: Action: Practice

21 Levator scapulae Sternocleidomastoid Digastric: Anterior belly Posterior belly Stylohyoid Mylohyoid Sternohyoid Suprahyoid group Infrahyoid group Anterior view Hyoid bone Common carotid artery Internal jugular vein Clavicle Thyrohyoid Omohyoid: Superior belly Inferior belly Sternothyroid SuperficialDeep Infrahyoid group 21 O: Manubrium & medial clavicle; I: Mastoid process of temporal bone Action: Flexion in neck against resistance

22 Trapezius Splenius capitis Sternocleidomastoid Levator scapulae Scalenes Omohyoid (inferior belly) Stylohyoid Mylohyoid Hyoglossus Digastric (posterior belly) Thyrohyoid Hyoid bone Inferior pharyngeal constrictor Sternohyoid Lateral view Omohyoid (superior belly) Digastric (anterior belly) Sternothyroid 22 Trapezius: O: Occipital bone, spine of C7 & all thoracic vertebrae; I: Acromion & spinous process of scapula Action: Extends heads, movement of scapula

23 Splenius capitis Levator scapulae Scalenes Hyoglossus Thyrohyoid Hyoid bone Inferior pharyngeal constrictor Lateral view Sternothyroid 23 Origin: Insertion: Action: Practice

24 Pectoralis major Tendinous intersections Linea alba Latissimus dorsi Rectus abdominis Inguinal ligament Rectus sheath (cut edges) Serratus anterior Aponeurosis of external abdominal oblique Umbilicus Linea semilunaris Transverse abdominal Internal abdominal oblique (cut) External abdominal oblique (cut) Rectus sheath Superficial muscles of the anterior abdominal wall 24

25 Subclavius Pectoralis minor (cut) Internal intercostals External intercostals Rectus abdominis (cut) External abdominal oblique (cut) Internal abdominal oblique (cut) Transverse abdominal (cut) Posterior wall of rectus sheath (rectus abdominis removed) Internal abdominal oblique Inguinal ligament Rectus sheath Serratus anterior Pectoralis minor 25 Deep muscles of the anterior abdominal wall

26 Subclavius External intercostals Posterior wall of rectus sheath (rectus abdominis removed) Inguinal ligament Rectus sheath 26 Deep muscles of the anterior abdominal wall Practice

27 O: Xiphoid process of sternum Esophagus Inferior vena cava Insertion: Central tendon of diaphragm External intercostals Internal intercostals Lateral view of intercostal muscles Inferior view of diaphragm O: Vertebral column O: Ribs 27 Action: Prime mover of inspiration

28 Sternocleidomastoid Deltoid Latissimus dorsi Thoracolumbar fascia External abdominal oblique Levator scapulae Rhomboideus major/minor Infraspinatus Teres minor Internal abdominal oblique Gluteus maximus Gluteus medius Gluteus minimus Lateral rotators Serratus posterior inferior Serratus anterior Supraspinatus Erector spinae Splenius capitis Teres major External abdominal oblique Trapezius Superficial Deep 28 Neck, back, and gluteal muscles O: Acromion and spine of scapula I: Deltoid tuberosity Action: Prime mover of arm abduction

29 Thoracolumbar fascia Lateral rotators Serratus posterior inferior Erector spinae Splenius capitis Superficial Deep 29 Neck, back, and gluteal muscles Origin: Insertion: Action: Practice

30 Clavicle Deltoid Sternum Pectoralis major Coracobrachialis Triceps brachii: Anterior view Long head Medial head Biceps brachii Brachialis Brachioradialis Lateral head 30

31 Posterior view Supraspinatus Spine of scapula Greater tubercle of humerus Infraspinatus Teres minor Teres major Triceps brachii: Lateral head Long head Latissimus dorsi Humerus O: glennoid cavity I: olecranon process of ulna Action: forearm extensor 31

32 Brachialis Subscapularis Coracobrachialis Anterior view O: Distal humerus I: coronoid process of ulna Action: Major flexor of forearm 32

33 (c) Deep flexors(b) Intermediate flexor(a) Superficial flexors Flexor digitorum superficialis Flexor digitorum profundus Supinator Flexor pollicis longus Biceps brachii Brachialis Pronator teres Brachioradialis Flexor carpi radialis Palmaris longus Flexor digitorum superficialis Extensor carpi radialis longus and brevis Triceps brachii Common flexor tendon Aponeurosis of biceps brachii Flexor carpi ulnaris Interosseous membrane Flexor pollicis longus Flexor digitorum superficialis tendons Flexor digitorum profundus tendons Common flexor tendon Palmar aponeurosis Flexor digitorum superficialis tendons Flexor digitorum profundus tendons Flexor retinaculum Anterior view 33 Anterior view of the forearm

34 (c) Deep flexors(b) Intermediate flexor(a) Superficial flexors Flexor digitorum profundus Common flexor tendon Aponeurosis of biceps brachii Interosseous membrane Flexor digitorum superficialis tendons Flexor digitorum profundus tendons Common flexor tendon Palmar aponeurosis Flexor digitorum superficialis tendons Flexor digitorum profundus tendons Flexor retinaculum Anterior view 34 Anterior view of the forearm Practice

35 Anconeus Supinator Abductor pollicis longus Extensor pollicis longus Extensor pollicis brevis Extensor indicis Olecranon Tendons of extensor digitorum (a) Superficial extensors(b) Deep extensors Posterior view Extensor carpi ulnaris Anconeus Triceps brachii Flexor carpi ulnaris Extensor digiti minimi Tendon of extensor indicis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Brachioradialis Tendons of extensor carpi radialis longus and brevis 35 Posterior view of the forearm

36 Medial epicondyle Lateral epicondyle Ulna Pronator quadratus Pronator teres Supinator Radius Supination Muscle actions in supination Pronation Ulna Bursa Biceps brachii Supinator 36

37 Iliac crest Iliopsoas: includes Iliacus Anterior superior iliac spine Iliotibial band Anterior muscles of thigh, superficial view Sartorius Rectus femoris Vastus lateralis Vastus medialis Quadriceps femoris tendon Patella Patellar ligament Adductor magnus Gracilis Adductor longus Pectineus Medial compartment: L5 Adductor brevis Anterior compartment: Tensor fasciae latae Psoas major 37 O: Iliac spine and superior acetabulum I: Tibial tuberosity and patella Action: Extend knee and flexes thigh at hip

38 Iliac crest Iliacus Anterior superior iliac spine Anterior muscles of thigh, superficial view Quadriceps femoris tendon Patella Patellar ligament Pectineus Medial compartment: L5 Adductor brevis Anterior compartment: Tensor fasciae latae Psoas major 38 Origin: Insertion: Action: Practice includes

39 Quadriceps femoris: Vastus lateralis Vastus medialis Quadriceps femoris tendon Patella Patellar ligament Vastus intermedius Anterior muscles of the thigh, deep view 39

40 Gluteus minimus Quadratus femoris Piriformis Gemellus superior Obturator internus Gemellus inferior Sacrum Gluteus maximus Coccyx Ischial tuberosity Iliac crest Obturator externus Lateral rotators: Superficial Deep Gluteus medius Gluteal muscles, posterior view 40

41 Gluteus medius Gluteus maximus Iliotibial band Short head Biceps femoris, long head Hamstring group: Semitendinosus Semimembranosus Adductor magnus Gracilis Vastus lateralis Posterior muscles of the hip and thigh Biceps femoris, long head: O: Ischial tuberosity I: Head of fibula & lateral condyle of tibia Action: Extends thigh, laterally rotates leg, & flexes knee 41

42 Short head Hamstring group: Posterior muscles of the hip and thigh Origin: Insertion: Action: 42 Practice

43 (a) Patellar ligament Fibularis longus Fibularis brevis Extensor digitorum longus Tibialis anterior Patella Tibia Gastrocnemius Soleus Extensor retinacula 43 O: Lateral condyle of tibia I: First cuneiform and metatarsal 1 Action: Prime mover of dorsiflexion

44 Extensor hallucis longus Fibularis tertius (c) 44

45 (d) Extensor digitorum longus 45

46 Gastrocnemius: Calcaneal tendon Calcaneus Medial head Lateral head Plantaris Tendon of gastrocnemius Superficial muscles of the leg, posterior compartment 46

47 Heads of gastrocnemius (cut) Popliteus Flexor digitorum longus Plantaris Soleus Flexor hallucis longus Tendon of plantaris Fibularis brevis Fibularis longus Gastrocnemius (cut) Deep muscles of the leg, posterior view 47

48 Calcaneal tendon (cut) Calcaneus (a) Flexor digitorum longus Flexor hallucis longus Popliteus Plantaris (cut) Soleus (cut ) Fibula Fibularis longus Fibularis brevis Gastrocnemius (cut) Tibialis posterior 48


Download ppt "Ex. 12: Skeletal Muscle 1. A. Characteristics of Three Muscle Types 2."

Similar presentations


Ads by Google