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ANAT: Arm and anterior forearm Flashcards

0
Q

Biceps brachii ORIGIN

A

Long head: supraglenoid tubercle of the scapula (tendon passes through the synovial cavity of the shoulder joint, the thru an osseofibrous tunnel in the intertubercular groove)
Short head: coracoid process of scapula

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1
Q

Biceps brachii INSERTION

A

Radial or bicipital tuberosity via a thick tendon; a portion of the tendon splits off medially and forms a broad sheet called the bicipital aponeurosis - fuses with deeper fascia of the forearm

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2
Q

Biceps brachii ACTION

A

strong supinator of forearm when flexed, flexor of elbow joint– especially when supinated; weak flexor of glenohumeral joint

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3
Q

Biceps Brachii INNERVATION

A

musculocutaneous n.

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4
Q

Coracobrachialis m. ORIGIN

A

Coracoid process

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5
Q

Coracobrachialis m. INSERTION

A

medial shaft of humerus

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6
Q

Coracobrachialis m. ACTION

A

Flexion and adduction of glenohumeral joint

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7
Q

Coracobrachialis m. INNERVATION

A

Musculocutaneous n.

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8
Q

Brachialis m. ORIGIN

A

Anterior humerus

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9
Q

Brachialis m. INSERTION

A

Ulnar tuberosity and coronoid process of ulna

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10
Q

Brachialis m. ACTION

A

Most powerful flexor of elbow

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11
Q

Brachialis m. INNERVATION

A

Musculocutaneous n.

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12
Q

Triceps brachii m. ORIGIN

A

Long head: Infraglenoid tubercle of scapula
Lateral head: Posterior humerus; superior to radial groove
Medial head: Posterior humerus; inferior to radial groove

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13
Q

Triceps brachii m. INSERTION

A

Olecranon process of the ulna

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14
Q

Triceps brachii m. ACTION

A

Extends elbow joint

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15
Q

Triceps brachii m. INNERVATION

A

Radial n.

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16
Q

Pronator teres m. ORIGIN

A

Medial epicondyle of humerus; coronoid process of ulna

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17
Q

Pronator teres m. INSERTION

A

Lateral side of shaft of radius; halfway up length

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18
Q

Pronator teres m. ACTION

A

Pronates forearm, assists in flexing elbow

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19
Q

Pronator teres m. INNERVATION

A

Median n.

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20
Q

Flexor carpi radialis m. ORIGIN

A

Medial epicondoyle of humerus

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21
Q

Flexor carpi radialis m. INSERTION

A

Base of second metacarpal

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22
Q

Flexor carpi radialis m. ACTION

A

Flexes wrist; assists in flexing elbow, abducts wrist

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23
Q

Flexor carpi radialis m. INNERVATION

A

Median n.

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24
Q

Palmaris longus m. ORIGIN

A

Medial epicondyle of humerus

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25
Q

Palmaris longus m. INSERTION

A

Flexor retinaculum at wrist; palmar aponeurosis

26
Q

Palmaris longus m. ACTION

A

Flexes wrist; assists in flexing elbow

27
Q

Palmaris longus m. INNERVATION

28
Q

Flexor carpi ulnaris m. ORIGIN

A

Medial epicondyle humerus; posterior border of ulna

29
Q

Flexor carpi ulnaris m. INSERTION

A

Pisiform bone and via ligaments to base of fifth metacarpal and to hook of Hamate

30
Q

Flexor carpi ulnaris m. ACTION

A

Flexes wrist and assists in flexing elbow; adducting wrist

31
Q

Flexor carpi ulnaris m. INNERVATION

32
Q

Flexor digitorum superficialis m. ORIGIN

A

Medial epicondyle humerus; ulna and radius

33
Q

Flexor digitorum superficialis m. INSERTION

A

Middle phalanges of digits II, III, IV, and V

34
Q

Flexor digitorum superficialis m. ACTION

A

Flexes MP and PIP joints, assists in flexing elbow and wrist

35
Q

Flexor digitorum superficialis m. INNERVATION

36
Q

Flexor pollicis longus m. ORIGIN

A

Anterior side of radius and interosseous membrane

37
Q

Flexor pollicis longus m. INSERTION

A

Distal phalanx of thumb (pollex)

38
Q

Flexor pollicis longus m. ACTION

A

Flexes MP and IP joints of thumb, assists in flexing wrist

39
Q

Flexor pollicis longus m. INNERVATION

40
Q

Flexor digitorum profundus m. ORIGIN

A

Anterior side of shaft of ulna, and interosseous membrane

41
Q

Flexor digitorum profundus m. INSERTION

A

Distal phalanges of digits II, III, IV, and V

42
Q

Flexor digitorum profundus m. ACTION

A

Flexes MP, PIP, and DIP joints; assists in flexing wrist

43
Q

Flexor digitorum profundus m. INNERVATION

A

Median n. to digits II and III,

Ulnar n. to digits IV, and V

44
Q

Pronator quadratus m. ORIGIN

A

Anterior side of ulna, distally

45
Q

Pronator quadratus m. INSERTION

A

Anterior side a radius, distally

46
Q

Pronator quadratus m. ACTION

A

Pronates forearm

48
Q

Pronator quadratus m. INNERVATION

49
Q

Brachial Fascia

A

Investing deep fascia of the arm,
Extensions of brachial fascia (medial and lateral intermuscular septa) attach to the humerus and divide the arm into anterior and posterior compartments

50
Q

Antebrachial fascia

A

Investing, deep fascia of the forearm

With the interosseous membrane, divides forearm into anterior and posterior compartments

51
Q

Flexor retinaculum

A

Thickening of the antebrachial fascia near the anterior wrist; with underlying bone, forms the carpal tunnel. Tendons of muscles of the anterior forearm as well as the median nerve pass through this compartment.

52
Q

Extensor retinaculum

A

Thickening of antebrachial fascia, near the posterior wrist. Tendons of muscles in the posterior compartment of the forearm pass deep to this retinaculum.

53
Q

Osseofibrous tunnel

A

Carpal tunnel in the upper limb

54
Q

Synovial sheath

A

double layer of synovial membrane in the osseofibrous tunnels that enclose the tendons, deep to the fibrous digital sheaths, and permits the free sliding movement of tendons.

55
Q

Musculocutaneous n. Innervation

A

coracobrachialis, biceps brachii, and brachialis

56
Q

Musculocutaneous n. termination

A

becomes the lateral cutaneous n. of the forearm and supplies skin on lateral side of forearm

57
Q

Radial n. innervation

A

triceps brachii, motor innervation to the posterior component of the forearm (posterior interosseus n.)

58
Q

Radial n. termination

A

Superficial branch - cutaneous innervation of the hand, courses in anterior compartment of the forearm
Deep branch - motor innervation of posterior forearm, becomes posterior interosseus n.

59
Q

Median n. path and innervation

A

courses with brachial artery, and along midline of forearm deep to pronator teres and FDS. Crosses wrist medial to FCR tendon and deep to palmaris longus, enters hand deep to flexor retinaculum (Through the carpal tunnel).
*Innervates nothing in arm, but all of the anterior forearm except FCU and 1/2 FDP

60
Q

Median n. termination

A

gives off anterior interosseus n. which courses with the anterior interosseus a. (branch of the common interosseus a.) and innervates the deep flexor muscles of the forearm.

61
Q

Ulnar n. path and innervation

A

courses down medial humerus with brachial a. and medial n., pierces medial septum of the arm, passes posterior to medial epicondyle (susceptible to injury).

  • runs down forearm deep to flexor carpi ulnaris and crosses wrist just lateral to its tendon and pisiform bone. Enter superficial to flexor retinaculum
  • innervates nothing in the arm, FCU and half of FDP
62
Q

Medial brachial cutaneous n.

A

branch of medial cord - supplies skin on the medial and anterior side of the arm

63
Q

Medial antebrachial cutaneous n.

A

a branch of the medial cord - supplies skin on the medial and anterior side of the forearm

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