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SHB Exam 1 > Arm > Flashcards

Arm Flashcards

1
Q

What holds the radius and ulna together (and is b/w them)?

A

Interosseous membrane

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2
Q

What dermatome innervates lateral arm, lateral forearm, and thumb?

A

C6

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3
Q

What dermatome innervates back of arm, back of forearm, and 2nd + 3rd digits?

A

C7

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4
Q

What dermatome innervates medial arm, medial forearm, and hypothenar?

A

C8

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5
Q

What dermatome innervates the nipple line?

A

T4

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6
Q

What vein runs medial in the brachium and branches to form the median cubital vein?

A

Basalic v.

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7
Q

The anterior compartment of the brachium is supplied by what nerve?

A

Musculocutaneous n.

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8
Q

The posterior compartment of the brachium is supplied by what nerve?

A

Radial n.

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9
Q

What is the most powerful flexor of the brachium?

A

Brachialis m.

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10
Q

Brachialis m: innervation & action

A
  • Musculocutaneous n. and radial n. (C7)

- Flexes forearm at elbow

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11
Q

Biceps brachii m: innervation & action

A
  • Musculocutaneous n. (C5, C6)

- Supinates and flexes forearm at elbow

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12
Q

What muscle is the primary supinator of the brachium?

A

Biceps brachii m.

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13
Q

Which head of the biceps brachii is lateral and which is medial?

A

Long head is lateral, short head is medial

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14
Q

Coracobrachialis m: innervation & action

A
  • Musculocutaneous n.

- Flexes and adducts arm at shoulder

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15
Q

Triceps brachii m: innervation & action.

A
  • Radial n.

- Extends arm at elbow. Long head stabilizes head of abducted humerus and extends and adducts arm at shoulder.

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16
Q

What divides the posterior and anterior compartments of the brachium?

A

Medial and lateral intermuscular septa

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17
Q

What three muscles are attached to the coracoid process?

A

Pectoralis minor m., coracobrachialis m., short head of the biceps brachii m.

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18
Q

The musculocutaneous n. pierces through what muscle?

A

Coracobrachialis m.

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19
Q

The biceps brachii tendon comes off what part of what bone?

A

Radial tuberosity of the radius bone (because it’s a supinator!)

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20
Q

Where is the bicipital apneurosis? What does it overly/protect, and what does it support during venipuncture?

A
  • It’s at the antecubitum
  • Overlies/protects the brachial a.
  • Supports the median cubital v. during venipuncture
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21
Q

Which head of the triceps is least active? What does it do?

A

Long head–aids primarily in extending the arm (attached to infra-glenoid tubercle of scapula)

22
Q

Which head of the triceps is the “workhorse” of forearm extension (works during passive motions), and where is it on the arm?

A

Medial head–found deep to the long head

23
Q

Which head of the triceps generates the most force, but functions primarily against active resistance?

A

Lateral head

24
Q

The brachial a. branches into what main aa.? Where does it branch?

A

Radial a. and ulnar a. Branches at elbow.

25
Q

What are the anastomoses about the elbow?

A

M.R. Deep
SIMR
PAIR
Superior ulnar colateral, Inferior ulnar colateral, Middle colateral, Radial colateral
Posterior ulnar recurrent, Anterior ulnar recurrent, Interosseous recurrent, radial recurrent

26
Q

What muscle overlays the 2nd group of arteriole branches of the axillary a. (Screw the lawyer, save a patient)

A

Pectoralis minor m. (*Dr. I)

27
Q

What is the muscular landmark indicating transition from axillary a. –> brachial a.?

A

Lower border of teres major m.

28
Q

What 3 mm. constitute the floor on which the brachial a. runs?

A

Superior to inferior: long head of the triceps, coracobrachialis, and brachialis mm.

29
Q

What are the 3 main branches of the brachial a.?

A

Deep brachial a. (profunda brachii, runs in radial groove posteriorly), superior ulnar colateral a., inferior ulnar colateral a.

30
Q

What 3 important nerves are associated w/the brachial a.?

A

Radial, ulnar, and median nn.

31
Q

What 3 veins are associated w/the brachial a.?

A

2 venae comitantes (brachial veins), and the basilic v.

32
Q

What does injury at the musculocutaneous n. cause?

A

Flexion at the elbow (but not complete, due to brachioradialis and flexor forearm mm.)

33
Q

What does the musculocutaneous n. turn into?

A

Lateral antebrachial cutaneous n.

(musculoCUTaneous, cuts, gives you a LAC (laceration).

34
Q

The radial n. passes thru the radial groove of the humerus w/what artery?

A

Deep brachial a.

35
Q

What nerves does the radial nerve branch into?

A

Posterior brachial n., inferior lateral brachial n., and posterior antebrachial cutaneous n.

36
Q

A sharp blow to the medial elbow (“funny bone”) is affecting what nerve?

A

Ulnar nerve

- Has no branches in arm

37
Q

What nerve is lateral, crosses, and is then medial to the brachial a. in the arm?

A

Median n.

38
Q

What large vein is on the lateral anterior side of the arm? Which os on the medial anterior side?

A
  • Lateral: cephalic v.

- Medial: basilic v.

39
Q

Explain the boundaries of the cubital fossa.

A
  • Superior: imaginary line connecting medial and lateral epicondyles.
  • Medial: lateral border of pronator teres m.
  • Lateral: medial border of brachioradialis
  • Floor: brachialis and supinator mm.
  • Roof: brachial and antebrachial fascia, reinforced by the bicipital apneurosis (protects)
40
Q

What are the contents of the cubital fossa?

A
  • Terminal part of the brachial a. (bifurcates into ulnar and radial aa.)
  • Medial n.
  • Radial n. (brach point into superficial and deep radial nn.)
  • Tendon of the biceps brachii m.
  • Deep veins in the area
41
Q

What area does the medial antebrachial cutaneous n. supply?

A

Some skin of bicep, but all skin of medial forearm down to the wrist

42
Q

What gives rise to the superior lateral cutaneous n of the brachium?

A

Axillary n.

43
Q

What dermatomes innervate the skin over the biceps mm.?

A

C5 and T1

44
Q

What m. inserts onto the ulnar tuberosity?

A

Brachialis m. (it’s merely a flexor, not a supinator)

45
Q

The long head of the biceps originates from the _________________________.

A

Supraglenoid tubercle of the scapula

46
Q

The lateral head of the triceps originates from the _______________________.

A

Upper half of posterior humerus

47
Q

Where do the biceps insert?

A

Posterior border of bicipital tuberosity of radius (over bursa) and bicipital aponeurosis to deep fascia and subcutaneous ulna

48
Q

Where do the triceps insert?

A

Posterior part of upper surface of olecranon process of ulna and posterior capsule

49
Q

The short head of the biceps originates from the _______________________.

A

Corocoid process of the scapula

50
Q

The long head of the triceps originates from the _________________________.

A

Infraglenoid tubercle of the scapula

51
Q

The medial head of the triceps originates from the _______________________

A

Deep to lower half of posterior humerus

SHB Exam 1 (19 decks)

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