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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
Palmaris longus m. ORIGIN
Medial epicondyle of humerus
25
Palmaris longus m. INSERTION
Flexor retinaculum at wrist; palmar aponeurosis
26
Palmaris longus m. ACTION
Flexes wrist; assists in flexing elbow
27
Palmaris longus m. INNERVATION
Median n.
28
Flexor carpi ulnaris m. ORIGIN
Medial epicondyle humerus; posterior border of ulna
29
Flexor carpi ulnaris m. INSERTION
Pisiform bone and via ligaments to base of fifth metacarpal and to hook of Hamate
30
Flexor carpi ulnaris m. ACTION
Flexes wrist and assists in flexing elbow; adducting wrist
31
Flexor carpi ulnaris m. INNERVATION
Ulnar n.
32
Flexor digitorum superficialis m. ORIGIN
Medial epicondyle humerus; ulna and radius
33
Flexor digitorum superficialis m. INSERTION
Middle phalanges of digits II, III, IV, and V
34
Flexor digitorum superficialis m. ACTION
Flexes MP and PIP joints, assists in flexing elbow and wrist
35
Flexor digitorum superficialis m. INNERVATION
Median n.
36
Flexor pollicis longus m. ORIGIN
Anterior side of radius and interosseous membrane
37
Flexor pollicis longus m. INSERTION
Distal phalanx of thumb (pollex)
38
Flexor pollicis longus m. ACTION
Flexes MP and IP joints of thumb, assists in flexing wrist
39
Flexor pollicis longus m. INNERVATION
Median n.
40
Flexor digitorum profundus m. ORIGIN
Anterior side of shaft of ulna, and interosseous membrane
41
Flexor digitorum profundus m. INSERTION
Distal phalanges of digits II, III, IV, and V
42
Flexor digitorum profundus m. ACTION
Flexes MP, PIP, and DIP joints; assists in flexing wrist
43
Flexor digitorum profundus m. INNERVATION
Median n. to digits II and III, | Ulnar n. to digits IV, and V
44
Pronator quadratus m. ORIGIN
Anterior side of ulna, distally
45
Pronator quadratus m. INSERTION
Anterior side a radius, distally
46
Pronator quadratus m. ACTION
Pronates forearm
48
Pronator quadratus m. INNERVATION
Median n.
49
Brachial Fascia
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
Antebrachial fascia
Investing, deep fascia of the forearm | With the interosseous membrane, divides forearm into anterior and posterior compartments
51
Flexor retinaculum
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
Extensor retinaculum
Thickening of antebrachial fascia, near the posterior wrist. Tendons of muscles in the posterior compartment of the forearm pass deep to this retinaculum.
53
Osseofibrous tunnel
Carpal tunnel in the upper limb
54
Synovial sheath
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
Musculocutaneous n. Innervation
coracobrachialis, biceps brachii, and brachialis
56
Musculocutaneous n. termination
becomes the lateral cutaneous n. of the forearm and supplies skin on lateral side of forearm
57
Radial n. innervation
triceps brachii, motor innervation to the posterior component of the forearm (posterior interosseus n.)
58
Radial n. termination
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
Median n. path and innervation
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
Median n. termination
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
Ulnar n. path and innervation
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
Medial brachial cutaneous n.
branch of medial cord - supplies skin on the medial and anterior side of the arm
63
Medial antebrachial cutaneous n.
a branch of the medial cord - supplies skin on the medial and anterior side of the forearm

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