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MSK Post-midterm > Anterior Forearm > Flashcards

Anterior Forearm Flashcards

1
Q

Anterior Forearm Osteology

A

Humerus (medial epicondyle is common flexor origin)
UIna (medial)
Radius (lateral)

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2
Q

Cutaneous Innervation of Arm, Forearm, Hand

A

Ulnar: medial hand, 4th and 5th digit and metacarpal

Musculocutaneous: Lateral forearm

Median: Palmar surface and dorsal lateral 3 digits

Radial Nerve: Dorsal tricep, forearm, lateral 3 digits

Axillary Nerve: dorsal shoulder region

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3
Q

Vasculature of the Arm & Forearm

A

Axillary a.

Brachial a.
deep brachial
middle collateral
radial collateral

superior ulnar collateral

inferior ulnar collateral

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4
Q

Blood supply to anterior forearm

A

ulnar artery

anterior interosseous artery

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5
Q

blood supply to posterior forearm

A

radial artery
recurrent interosseous artery
posterior interosseous artery
ulnar artery

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6
Q

Blood supply to anterior hand

A

superficial palmar arch (ulnar artery)

Deep palmar arch (radial artery)

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7
Q

Superficial Muscles of Anterior Forearm

A

Pronator teres

Flexor carpi radialis

Palmaris longus

Flexor carpi ulnaris

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8
Q

Intermediate muscles of Anterior Forearm

A

Flexor digitorum superficialis

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9
Q

Deep Muscles of Anterior Forearm

A

Flexor pollicis longus

Pronator quadratus

Flexor digitorum profundus

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10
Q

Pronator Teres

A

Origin: medial epicondyle of humerus
coronoid process of ulna

Insertion: middle of lateral surface of radius

Axns: pronates forearm
flexes forearm at elbow

Blood: ant. ulnar recurrent artery

Nerve: Median nerve (C6, 7)

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11
Q

Flexor Carpi Radialis

A

Origin: medial epicondyle of humerus

Insertion: base of 2nd metacarpal

Axns: flexes hand at wrist
abducts hand at wrist

Blood: ulnar artery

Nerve: Median Nerve (C6, C7)

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12
Q

Palmaris Longus (can be absent)

A

Origin: medial epicondyle of humerus

Insertion: flexor retinaculum (continuous w/ palmar aponeurosis)

Axns: flexes hand at wrist
tenses palmar aponeurosis

Blood: ulnar artery

Nerve: Median (C7, C8)

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13
Q

Flexor Carpi Ulnaris

A

Origin: medial epicondyle of humerus (humeral head)
Olecranon and posterior border of ulna (ulnar head)

Insertion: pisiform, hook of hamate, 5th metacarpal

Axns: flexes hand
adducts hand

Blood: ulnar artery

Nerve: ulnar nerve (C7, C8)

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14
Q

Flexor Carpi Ulnaris and Cubital Tunnel Syndrome

A

Ulnar nerve pinched in cubital tunnel (tendonous arch formed by ulnar and humeral head of FCU in elbow region)

Numbness and tingling in medial part of palm and medial digits

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15
Q

Flexor digitorum superficialis

A

Origin: medial epicondyle of humerus
superior 1/2 of ant. border of radius

Insertion: shafts of middle phalanges of medial 4 digits

Axns: flexes mid. phalanx at PIP joints
flexes prox. phalanx at MCP joints

Blood: Ulnar artery

Nerve: Median Nerve (C7, C8, T1)

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16
Q

Flexor digitorum profundus

A

Origin: prox. 3/4 of medial and anterior surfaces of ulna
interosseous membrane

Insertion: bases of distal phalanges of 2nd - 5th fingers

Axns: flexes distal phalanges at IP joints (power grip)

Blood: anterior interosseous artery

Nerve: median and ulnar nerves (C8, T1)

17
Q

Flexor Pollicis Longus

A

Origin: ant. surface of radius and interosseous membrane

Insertion: base of distal phalanx of thumb

Axns: flexes thumb

Blood: anterior interosseous artery

Nerve: median nerve via ant. interosseous nerve (C8, T1)

18
Q

Pronator quadratus

A

Origin: distal 1/4 of ant. surface of ulnar

Insertion: distal 1/4 of ant. surface of radius

Axns: pronates forearm
deep fibers bind radius and ulnar together

Blood: anterior interosseous artery

Nerve: median nerve via ant. interosseous nerve C8, T1

19
Q

Anatomical Relationships

A

From lateral to medial (in anatomical position)
Superficial branch of radial nerve

Radial Artery

Median Nerve

Ulnar Artery

Ulnar Nerve

Slide 25

20
Q

Ulnar Nerve Track

A

Posterior to medial epicondyle

Runs along medial forearm under flexor carpi ulnaris

Through Guyon’s canal lateral to pisiform

Enters and supplys most of intrinsic hand muscles

21
Q

Ulnar Nerve and Artery Track

A

Run together (nerve medial)

artery under and just lateral to flexor carpi ulnaris

both run lateral to pisiform bone and Guyon’s canal

22
Q

Median Nerve Track

A

Runs through pronator teres

Deep to flexor digitorum superficialis

between FDS and FD profundus

runs deep to flexor retinaculum through carpal tunnel

23
Q

Radial Artery

A

Medial to superficial branch of radial nerve

nerve is lateral

runs under or just medial to brachioradialis

24
Q

Anterior interosseous nerve and artery

A

run deep (posterior) to pronator teres

25
Q

A 20 year old female is hit by a car while riding her bike. She sustains a concussion, a fractured mandible, and a broken arm. In the emergency department she has difficulty making a fist. Her hand and wrist are hyperextended. She is unable to flex her 4th and 5th digits. What part of her arm did she fracture? What nerve is injured?

A

Medial epicondyle of humerus (flexor origin)

Ulnar Nerve

Pg 769 in COA

MSK Post-midterm (10 decks)

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