Copyright © 2010 Pearson Education, Inc. Muscles of the Body Part C Adapted for H. Biology II...

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Transcript of Copyright © 2010 Pearson Education, Inc. Muscles of the Body Part C Adapted for H. Biology II...

  • Slide 1
  • Copyright 2010 Pearson Education, Inc. Muscles of the Body Part C Adapted for H. Biology II 2014-2015 Muscles of Upper Extremities and Shoulder
  • Slide 2
  • Copyright 2010 Pearson Education, Inc. Muscles Crossing the Shoulder Joint Nine muscles cross the shoulder joint to insert on and move the humerus
  • Slide 3
  • Copyright 2010 Pearson Education, Inc. Muscles Crossing the Shoulder Joint Some originate off the scapula; others originate off the axial skeleton Three are prime movers of the arm Pectoralis major Latissimus dorsi Deltoid Actions include flexion, extension, adduction, abduction, and rotation of humerus
  • Slide 4
  • Copyright 2010 Pearson Education, Inc. Muscles Crossing the Shoulder Joint Four muscles are rotator cuff muscles Supraspinatus Infraspinatus Teres minor Subscapularis Reinforce the capsule of the shoulder Act as synergists and fixators Two additional muscles are synergists: coracobrachialis and teres major
  • Slide 5
  • Copyright 2010 Pearson Education, Inc. Figure 10.14a Clavicle Deltoid Sternum Pectoralis major Lateral head Long head Medial head Coracobrachialis Triceps brachii: Biceps brachii Brachialis Brachioradialis (a) Anterior view
  • Slide 6
  • Copyright 2010 Pearson Education, Inc. Figure 10.14b Supraspinatus* Spine of scapula (b) Posterior view Deltoid (cut) Greater tubercle of humerus Infraspinatus* Teres minor* Teres major Triceps brachii: Latissimus dorsi Humerus Olecranon process of ulna Lateral head Long head Anconeus * Rotator cuff muscles
  • Slide 7
  • Copyright 2010 Pearson Education, Inc. Table 10.12 Part 1
  • Slide 8
  • Copyright 2010 Pearson Education, Inc. Figure 10.14a Clavicle Deltoid Sternum Pectoralis major Lateral head Long head Medial head Coracobrachialis Triceps brachii: Biceps brachii Brachialis Brachioradialis (a) Anterior view
  • Slide 9
  • Copyright 2010 Pearson Education, Inc. Muscles Crossing the Elbow Joint Posterior extensor muscles Triceps brachiiprime mover of forearm extension Anconeusweak synergist
  • Slide 10
  • Copyright 2010 Pearson Education, Inc. Figure 10.14b Supraspinatus* Spine of scapula (b) Posterior view Deltoid (cut) Greater tubercle of humerus Infraspinatus* Teres minor* Teres major Triceps brachii: Latissimus dorsi Humerus Olecranon process of ulna Lateral head Long head Anconeus * Rotator cuff muscles
  • Slide 11
  • Copyright 2010 Pearson Education, Inc. Figure 10.17a Triceps brachii Lateral head Humerus Long head Medial head (a) Brachialis Short head Long head (a) Muscles of the arm Extensors Flexors Others Posterior compartment of arm (extends elbow); innervation: radial nerve Biceps brachii Anterior compartment of arm (flexes elbow); innervation: musculocutaneous nerve
  • Slide 12
  • Copyright 2010 Pearson Education, Inc. Table 10.12 Part 2
  • Slide 13
  • Copyright 2010 Pearson Education, Inc. Muscles of the Forearm Actions: movements of the wrist, hand, and fingers Most anterior muscles are flexors and insert via the flexor retinaculum Most posterior muscles are extensors and insert via the extensor retinaculum
  • Slide 14
  • Copyright 2010 Pearson Education, Inc. Muscles of the Forearm Some forearm muscles act to produce pronation and supination of the forearm
  • Slide 15
  • Copyright 2010 Pearson Education, Inc. Muscles of the Forearm Pronators: pronator teres and pronator quadratus Supinator: a synergist with the biceps brachii
  • Slide 16
  • Copyright 2010 Pearson Education, Inc. Muscles of the Forearm: Anterior Compartment Flexors Flexor carpi radialis Palmaris longus Flexor carpi ulnaris Flexor digitorum muscles (superficialis and profundus) Flexor pollicis longus
  • Slide 17
  • Copyright 2010 Pearson Education, Inc. Figure 10.15a Biceps brachii Tendon of biceps brachii Pronator teres Brachioradialis Extensor carpi radialis longus Flexor pollicis longus Pronator quadratus Flexor retinaculum Medial head of triceps brachii Medial epicondyle of humerus Flexor carpi radialis Palmar aponeurosis Superficial transverse ligament of palm Palmaris longus Flexor carpi ulnaris Flexor digitorum superficialis (a)
  • Slide 18
  • Copyright 2010 Pearson Education, Inc. Figure 10.15c Supinator Tendon of flexor carpi ulnaris (cut) Tendon of flexor digitorum profundus Flexor pollicis longus Thenar muscles of thumb Tendon of flexor pollicis longus Lumbricals Tendon of flexor digitorum superficialis (cut) Pronator quadratus Flexor digitorum profundus (c)
  • Slide 19
  • Copyright 2010 Pearson Education, Inc. Muscles of the Forearm: Posterior Compartment Extensors Extensor carpi radialis longus and brevis Extensor digitorum Extensor carpi ulnaris Extensor pollicis brevis and longus Extensor indicis Abductor pollicis longus
  • Slide 20
  • Copyright 2010 Pearson Education, Inc. Figure 10.16a Insertion of triceps brachii Anconeus Flexor carpi ulnaris Extensor carpi ulnaris Extensor digiti minimi Extensor indicis Tendons of extensor carpi radialis brevis and longus Extensor expansion (a) Extensor pollicis longus Extensor pollicis brevis Abductor pollicis longus Extensor digitorum Extensor carpi radialis brevis Extensor carpi radialis longus Brachioradialis Tendons of extensor digitorum
  • Slide 21
  • Copyright 2010 Pearson Education, Inc. Figure 10.16b Olecranon process of ulna Interossei Anconeus Supinator Abductor pollicis longus Extensor pollicis longus Extensor pollicis brevis Extensor indicis (b)
  • Slide 22
  • Copyright 2010 Pearson Education, Inc. Figure 10.17b Extensors Flexors Others (b) Flexors Extensors Ulna Posterior compartment of forearm (extends wrist and fingers); innervation: radial nerve Others Radius Pronator teres Brachioradialis (elbow flexor) Abductor pollicis longus (b) Muscles of the forearm Anterior compartment of forearm (flexes wrist and fingers); innervation: median or ulnar nerve
  • Slide 23
  • Copyright 2010 Pearson Education, Inc. Figure 10.12 Part 3
  • Slide 24
  • Copyright 2010 Pearson Education, Inc. Intrinsic Muscles of the Hand Small weak muscles Lie entirely within the palm of the hand Control precise movements of metacarpals and fingers (e.g., threading a needle) Abductors and adductors of the fingers Produce oppositionmove the thumb toward the little finger
  • Slide 25
  • Copyright 2010 Pearson Education, Inc. Finger and Thumb Movements Flexion Thumbbends medially along the palm Fingersbend anteriorly Extension Thumbpoints laterally Fingersmove posteriorly
  • Slide 26
  • Copyright 2010 Pearson Education, Inc. Intrinsic Muscles of the Hand Three groups Thenar eminence (ball of the thumb) Hypothenar eminence (ball of the little finger) Each of the above groups has a flexor, an abductor, and an opponens muscle Midpalmar muscles: lumbricals and palmar and dorsal interossei extend the fingers Interossei muscles also abduct and adduct the fingers
  • Slide 27
  • Copyright 2010 Pearson Education, Inc. Figure 10.18a Flexor digitorum profundus Tendons of: Flexor digitorum superficialis Third lumbrical Fourth lumbrical Opponens digiti minimi Flexor digiti minimi brevis Abductor digiti minimi Pisiform bone Flexor carpi ulnaris tendon Flexor digitorum superficialis tendons Flexor pollicis longus Flexor carpi radialis Palmaris longus Flexor retinaculum Abductor pollicis longus Opponens pollicis Abductor pollicis brevis Flexor pollicis brevis Adductor pollicis Dorsal interossei First lumbrical Second lumbrical Fibrous sheath (a) First superficial layer Tendons of:
  • Slide 28
  • Copyright 2010 Pearson Education, Inc. Figure 10.18b Flexor digitorum profundus tendon Flexor digitorum superficialis tendon Palmar interossei Opponens digiti minimi Flexor digiti minimi brevis (cut) Abductor digiti minimi (cut) Flexor pollicis longus tendon Opponens pollicis Abductor pollicis brevis Flexor pollicis brevis Adductor pollicis Dorsal interossei (b) Second layer
  • Slide 29
  • Copyright 2010 Pearson Education, Inc. Figure 10.18c Palmar interossei (c) Palmar interossei (isolated)
  • Slide 30
  • Copyright 2010 Pearson Education, Inc. Figure 10.18d Dorsal interossei (d) Dorsal interossei (isolated)