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SHB > Arm & Forearm > Flashcards

Arm & Forearm Flashcards

1
Q

Where does radial nerve run in humerus?

A

In the spinal groove

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2
Q

Medial epicondyle

A

Where the flexors originate on humerus

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3
Q

Lateral epicondyle

A

Where extensors originate on humerus

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4
Q

Ulna

A

Flexes and extends forearm by wrapping around humerus. Places olecranon process in olecranon fossa and moving around trochlea

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5
Q

Radius

A

Rolls around capitulum for pronation and supination

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6
Q

Interosseous membrane

A

Connects radius and ulna

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7
Q

C6 Dermatome inervates

A

Lateral Arm, Forearm & Thumb

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8
Q

C7 Dermatome inervates

A

Back of Arm, Back of Forearm, 2nd & 3rd digits

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9
Q

C8 Dermatome inervates

A

Medial Arm, Forearm

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10
Q

Basillic Vein

A

Runs down medial side of upper arm

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11
Q

Caphalic vein

A

Runs does lateral side of upper arm

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12
Q

Which sides are short and long head of bicep on and where do they attach?

A

Short - medial - looks longer - attaches to coracoid process
Long - Lateral - attaches to scapula on superglenoid tubercle making it longer

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13
Q

The bicipital aponeurosis

A

Thickening of bicep fascia overlies & protects median nerve & brachial artery. Supports median cubital vein during venipuncture.

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14
Q

What must the bicep do before it can engage in flection?

A

Supinate

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15
Q

What holds the bicep tendon in place and where is it held?

A

Held in the intertubercular groove by the transverse humeral ligament and the Pec Major m

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16
Q

Insertion of Bicep, Brachialis?

A

Raidus, Unla. Brachialis is main flexor of forearm as it attaches to ulna which is main bone that moves forearm

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17
Q

What nerve pierces corachobrachealis? And where does it go?

A

Musculocutaneous - innervates biceps from deep side, lays on top brachealis,

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18
Q

Which tricep arm is least/ most active?

A

Least: Long, extends arm (on inside of arm)
Most: Medial, general smaller motions
Lateral is strongest generator of force but functions against active resistance (not during passive motions) only when doing large motion like push up

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19
Q

What can long tricep head do that others cant?

A

Aid in extension of arm as it crosses glenohumeral joint

20
Q

What is the brachial artery a continuation of and what does it divide into?

A

Axillary artery dividing into radial and ulnar at cubital fossa

21
Q

3 Muscles Brachial A. Lies on?

A

Long head triceps, coracobrachialis, brachialis

22
Q

3 main branches of Brachial artery ?

A

Deep brachial (profunda brachii; runs in radial groove posteriorly), the superior ulnar collateral, and inferior ulnar collateral arteries.

23
Q

What does injury to muculocutaneous cause?

A

Great loss of flexion of elbow, although not complete due to brachioradialis and flexor forearm muscles.

24
Q

Where does radial nerve travel?

A

Radial groove on back of humerus traveling with deep brachial artery

25
Q

If you break humerus low will triceps still work?

A

Yes! Radial nerve innervates triceps high on humerus

26
Q

Relation of Median nerve to brachial artery in arm?

A

Starts laterally, then moves medially

27
Q

Boundaries of cubital fossa?

A

Superior - line connecting epicondyles.
Medial - forearm flexors (pronator teres m.)
Lateral - forearm extensors (brachioradialis m.)
Floor - brachialis and supinator mm.
Roof - brachial and antebrachial fascia reinforced by bicipital aponeurosis

28
Q

Contents of Cubital Fossa?

A 
Terminal part of the brachial artery 
Deep veins in the area 
Tendon of the biceps brachii m. 
Median n.
Radial n.
29
Q

What does the extensor retinaculum do?

A

Extends obliquely across distal forearm preventing tendons from bowstringing

30
Q

What does the flexor retinaculum do?

A

Same as extensor. Also covers carpal tunnel. If tunnel compressed, median nerve that travels through will have issues.

31
Q

Which nerve innervates ring and pinky finger?

A

Ulnar

32
Q

Difference between flexor digitorum superficialis & profundus?

A

Superficial goes to intermediate phalanges. Deep to distal.

33
Q

Innervation of Flexor digitorum profundus?

A

Digits 2-3: Median

Digits 4-5: Ulnar

34
Q

What does pollicis mean in latin?

A

Thumb

35
Q

Contents of Snuff box

A

Floor - Radial artery
Roof - Branches of superficial radial nerve
Palpations - Styloid process of radius

36
Q

Boundaries of snuff box

A

Laterally - abductor pollicis longus and extensor pollicis brevis
Medially - extensor pollicis longus tendon

37
Q

Common Interosseous artery

A

Trunk off the ulnar a. extending laterally. 2 branches:
Anterior interosseous. Travels down forearm superficial to the interosseous membrane. Continues under pronator quadratus to palm
Posterior interosseous. Passes immediately deep to the interosseous membrane to supply the posterior forearm

38
Q

Where does median nerve enter forearm? Path?

A

Enters forearm between heads of pronator teres. Gives off Anterior interosseous. Lies deep to the FDS. Becomes superficial in the distal forearm. Found between tendons of Flexor digitorum superficialis and Flexor carpi radialis mm. Passes deep and medial to Palmaris longus tendon, enters carpal tunnel deep to flexor retinaculum. Supplies thenar muscles and 1st & 2nd Lumbricals in hand. Gives off palmar branch to skin of palm.

39
Q

Anterior interosseous branch of median nerve destinations

A

Supplies:
Flexor pollicis longus m.
Pronator quadratus m.

40
Q

Where do ulnar A / N enter hand?

A

Canal of Guyon

41
Q

Where is the capitulum and what does it do?

A

Distal lateral end of humerus

Articular surface with radius

42
Q

Difference between dermatome and cutaneous nerve?

A

Dermatome: area of skin innervated by one spinal cord element
Cutaneous nerve: carry fibers from multiple spinal cord segments to target skin area

43
Q

Difference between extrinsic and intrinsic hand muscles?

A

Extrinsic: arise in forearm
Intrinsic: Arise in hand

44
Q

What is a tuberosity?

A

Rough area on bone formed by muscle attachment

45
Q

What are bursae?

A

Small fluid-filled sac with inner layer of viscous fluid providing cushion between bones and tendons helping reduce friction

46
Q

Styloid process of radius?

A

Lateral distal end of raidus

47
Q

What does deep branch of radial nerve supply

A

Extensor brevis and supinator. After piercing supinator, called posterior interosseus and innervates rest of muscles. Radial proper innervates extensor radialus longus.

SHB (23 decks)

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