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MSS - MSK Exam 2 > Brachium and Cubital Fossa > Flashcards

Brachium and Cubital Fossa Flashcards

1
Q

brachial fascia?

A

continuous with fascia of shoulder muscles above, attached to humeral epicondyles and olecranon process

continuous with the antebrachial fascia below

**encases are in cylindrical sheath

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2
Q

what separates arm into anterior and posterior compartments?

A

intermuscular septa

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3
Q

intermuscular septa?

A

two laminae that enclose the neurovascular compartment

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4
Q

neurovascular compartment of arm

A

brachial artery and veins, median nerve, and musculocutaneous and ulnar nerves superiorly

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5
Q

biceps brachii attachments?

A

origin:
long head - supraglenoid tubercle of scapula
short head - coracoid process of scapula

insertion:
common tendon to radial tubersoity, also via bicipital aponeurosis to antebrachial fascia covering the flexor forearm muscles

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6
Q

biceps brachii action?

A

flexes forearm and supinates the hand
most powerful supinator above 90 degree flexion
long head also assists in flexion of arm

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7
Q

biceps brachii innervation?

A

musculocutaneous nerve

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8
Q

brachialis attachments?

A

origin:
half way up anterior surface of humerus

insertion:
coronoid process and tuberosity of ulna

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9
Q

brachialis action?

A

flexion of forearm

-most powerful of three primary forearm flexors

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10
Q

brachialis innervation?

A

musculocutaneous nerve

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11
Q

anterior compartment muscles?

A

biceps brachii, brachialis, and coracobrachialis

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12
Q

brachioradialis attachments?

A

origin:
lateral supercondylar ridge of humerus

insertion:
lateral radius at base of styloid process

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13
Q

brachioradialis action?

A

flexion of foerarm

-best mechanical advantage when hand is midway between supination and pronation (handshake)

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14
Q

brachioradialis innervation?

A

radial nerve

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15
Q

corachobrachialis attachments?

A

origin:
coracoid process of scapula

insertion:
middle third, medial surface of humerus

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16
Q

corachobrachialis actions?

A

flexion, adduction of humerus

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17
Q

corachobrachialis innervation?

A

musculocutaneous nerve

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18
Q

muscles of posterior compartment of arm?

A

triceps brachii and anconeus

19
Q

triceps brachii attachments?

A

origin:
long head - infraglenoid tubercle of scapule
lateral head - posterior surface of humerus proximal to radial groove
medial head - posterior surface of humerus distal to radial groove

insertion:
posterior surface of olecranon process of ulna

20
Q

triceps brachii actions?

A

all heads act to extend forearm

long head extends and adducts arm

21
Q

triceps brachii innervation?

A

radial nerve

22
Q

anconeus attachments?

A

origin:
poseterior surface lateral epicondyle of humerus

insertion:
lateral surface of olecranon and proximal posterior surface of ulna

23
Q

anconeus actions?

A

assists triceps in extension of forearm

24
Q

anconeus innervations?

A

radial nerve

25
Q

three primary forearm flexors?

A

biceps brachii, brachialis, brachioradialis

26
Q

beginning of brachial artery?

A

continuation of axillary once it passes inferior border of teres major

27
Q

course of brachial artery?

A

courses within neurovascular compartment through medial brachium

28
Q

end of brachial artery?

A

within cubital fossa when it divides to radial and ulnar arteries

29
Q

deep brachial artery?

A

largest branch of brachial artery

  • arises posteromedial aspect
  • accompanies radial nerve
  • ends when divides into middle and radial collateral arteries which anastamose with interosseus and radial recurrent arteries, respectively
30
Q

superior ulnar collateral artery?

A

branch of medial mid brachial artery
-courses inferiorly with ulnar nerve and goes posterior to medial epicondyle

-anastomose with posterior ulnar recurrent

31
Q

inferior ulnar collateral artery?

A

branch of medial distal brachial artery

-courses anterior to medial epicondyle and anastomose with anterior ulnar recurrent artery

32
Q

cephalic vein

A

superficial vein

-arises on lateral dorsum of hand and goes superior through forearm and along anterolateral surface of bicep

courses between deltoid and pectoralis major to disappear within deltopectoral triangle where it will pierce costocoracoid membrane to join axillary vein

33
Q

basilic vein

A

superficial vein

arises on medial dorsum of hand and goes posteriomedial aspect of forearm and medial surface of arm piercing brachial fascia at midportion

34
Q

median cubital vein

A

joins cephailc and basilic veins

anastomosis is variable

35
Q

brachial vein

A

deep veins

formed by union of radial and ulnar veins

course parallel to brachial artery

-superficial basilic vein, after piercing brachial fascia, runs parallel to brachial veins

36
Q

where does basilic vein join brachial vein?

A

at approximately the inferior border of teres major muscle

forms the axillary vein

37
Q

median nerve

A

C6, C7, C8, T1

exits axilla anterior to brachial artery
-in neurovascular compartment becomes medial to artery

courses through cubital fossa deep to the bicipital aponeurosis

NO BRANCHES TO BRACHIUM

38
Q

ulnar nerve

A

C8, T1

exits axilla medial to brachial artery in brachial neurovascular compartment

exits compartment with superior ulnar collateral midway in brachium by piercing the posterior lamina of medial intermuscular septum

travels inferiorly along posterior surface of septum to eventually exit arm between medial epicondyle of humerus and olecranon process of ulna

39
Q

musculocutaneus nerve

A

C5, C6, C7

leaves axilla lateral to axillary artery and traverses corachobrachialis piercing it

runs inferiorly between biceps and brachialis

exits under lateral inferior edge of biceps to become lateral antebrachial cutaneous nerve

innervates corachobrachialis, biceps, brachialis (anterior compartment)

40
Q

radial nerve

A

C5, C6, C7, C8, T1

exits axilla posterior to brachial artery and anterior to long head of triceps

courses between lateral and medial heads of triceps within radial groove with the deep brachial artery

after circumventing the humerus, nerve pierces the lateral intermuscular septumand comes to lie between the brachialis and brachioradialis muscles

at lateral epicondyle, divides into superficial and deep branches

pass via separate routes in forearm

in arm, radial nerve innervates triceps, and a portion of skin on posterior surface of arm

41
Q

radial groove?

A

between medial and lateral head of triceps brachii

location of the radial nerve and deep brachial artery

42
Q

boundaries of cubital fossa?

A 
lateral - brachioradialis 
medial - pronator teres
superior - line drawn through both humeral epicondyles
roof - deep fascia
floor - brachialis and supinator
43
Q

contents of cubital fossa?

A

tendon, artery, nerve (lateral to medial)

biceps tendon
brachial artery divides to radial and ulnar
median nerve

44
Q

structures associated with cubital fossa

A

superficial:
median cubital nerve and latera antebrachial cutaneous nerve (from musculocutaneous)

deep:
bifurcation of radial nerve into its superficial and deep branches

MSS - MSK Exam 2 (13 decks)

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