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Muscles > Arm > Flashcards

Arm Flashcards

1
Q

What nerve pierces the medial intermuscular septum?

A

Ulnar nerve

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2
Q

What nerve pierces the lateral intermuscular septum?

A

Radial nerve

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3
Q

Origin of Coracobrachialis Muscle

A

Coracoid process of scapula

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4
Q

Insertion of Coracobrachialis Muscle

A

Middle of medial aspect of humerus

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5
Q

Nerve Supply of Coracobrachialis Muscle

A

Musculocutaneous nerve

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6
Q

Action of Coracobrachialis Muscle

A
  • flexion of shoulder joint

- adduction of the arm

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7
Q

Origin of Biceps Brachii Muscle

A

Short head: coracoid process

Long head: supraglenoid tubercle of the scapula

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8
Q

Insertion of Biceps Brachii Muscle

A

Posterior part of the radial tuberosity

Bicipital aponeurosis into the deep fascia of the cubital fossa

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9
Q

Relation of Biceps brachii to shoulder

A

Intracapsular, extrasynovial

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10
Q

Nerve supply of Biceps brachii

A

Musculocutaneous nerve

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11
Q

Actions of Biceps brachii

A

Flexor of the elbow
Supinator of flexed arm
Long head: stabilises shoulder joint

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12
Q

Origin of Brachialis

A

Lower half of the front of the shaft of the humerus and the front of the two intermuscular septa

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13
Q

Insertion of Brachialis

A

Cornoid process of ulna and ulnar tuberosity

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14
Q

Nerve supply of the Brachialis

A 
Musculocutaneous 
Radial nerve (for the lateral part)
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15
Q

Action of Brachialis

A

Main flexor of the elbow joint

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16
Q

Origin of Musculocutaneous nerve

A

Branching from the lateral cord of the Brachial plexus

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17
Q

Termination of Musculocutaneous nerve

A

By continuing as the lateral cutaneous nerve of the forearm

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18
Q

Course of Musculocutaneous nerve

A

Descends lateral to the 3rd part of the axillary artery between it and the coracobrachialis muscle. It pierces the Coracobrachialis

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19
Q

Branches of Musculocutaneous nerve

A
  • 2 heads of biceps brachii
  • Coracobrachialis
  • greater part of brachialis
20
Q

Origin of Brachial Artery

A

Lower border of teres major as a continuation of the axillary artery

21
Q

Termination of Brachial Artery

A

Ends opposite the neck of the radius

Divides into radial and ulnar terminal arteries

22
Q

The brachial artery is laterally related to

A

The median nerve

23
Q

The brachial artery is medially related to

A

The basilic vein

24
Q

Branches of the brachial artery

A
  • profunda brachii artery
  • muscular branches
  • nutrient artery to the humerus
  • superior ulnar collateral artery
  • inferior ulnar collateral artery
  • radial and ulnar terminal branches
25
Q

Contents of Posterior Compartment of the Arm

A
  • triceps muscle
  • radial nerve
  • profunda brachii vessels
  • superior ulnar collateral vessels
  • posterior branch of inferior ulnar collateral
26
Q

Origin of Triceps Muscle

A
  • long head: infraglenoid tubercle
  • lateral head: back of the humerus above the spiral groove
  • medial head: back of the humerus below the spiral groove
27
Q

Insertion of Triceps

A

Olecranon process of ulna

28
Q

Nerve Supply of Triceps

A

Radial Nerve

29
Q

Actions of Triceps

A
  • main extensor of the arm
  • long head shares in stability of shoulder
  • long head helps in adduction
30
Q

Median Nerve Origin

A

Medial root: C8, T1
Lateral root: C5 C6 C7
Unison if two roots

31
Q

Course of the Median Nerve

A
  • lateral to 3rd part of axillary artery and upper half of brachial artery
  • crosses in front of the brachial artery at the middle of the arm
  • descends medial to the artery down to the cubital fossa
  • enters the forearm by passing between 2 heads of pronator teres
32
Q

Branches of the median nerve in arm

A

None

33
Q

Origin of the Ulnar Nerve

A

C7, C8, T1

Branch if medial cord of brachial plexus

34
Q

Course of the Ulnar Nerve

A
  • descends close to the medial side of the 3rd part of axillary artery and upper half of brachial artery
  • at the mid-humeral shaft, it pierces the medial intermuscular septum to reach the posterior compartment
  • descends down to the back of the medial epicondyle
  • enters the forearm by passing between the two heads of flexor carpi ulnaris muscle
35
Q

Branches of Ulnar Nerve in arm

A

None

36
Q

Origin of Radial Nerve

A

Posterior Cord of Brachial Plexus

37
Q

Course of Radial Nerve

A
  • descends posterior to the 3rd part of the axillary artery and brachial artery
  • in the spiral groove, it lies in the middle of the medial and lateral heads of the triceps
  • pierces the lateral intermuscular septum to reach the front of the arm
  • descends between brachialis and brachioradialis
38
Q

Branches of the Radial Nerve in the Axilla

A
  • muscular branches to long and medial heads of triceps

- posterior cutaneous nerve of the arm

39
Q

Branches of the Radial Nerve in the Arm (Spiral Groove)

A
  • muscular branches to the lateral and medial heads of triceps
  • muscular branch to the anconeus muscle
  • lower lateral cutaneous nerve of the arm
  • posterior cutaneous nerve of the forearm
40
Q

Branches of the Radial Nerve in the groove between brachialis and brachioradialis

A
  • muscular branch to brachialis
  • muscular branch to brachoradialis
  • muscular branch to extensor carpi radialis longus
41
Q

Medial Boundary of Cubital fossa

A

Pronator Teres

42
Q

Lateral Boundary of Cubital Fossa

A

Brachioradialis

43
Q

Base of Cubital Fossa

A

Imaginary line connecting the two humeral epicondyles

44
Q

Apex of Cubital fossa

A

Point of overlap of brachioradialis over pronator teres

45
Q

Roof of cubital fossa

A
  • skin
  • superficial fascia
  • deep fascia
  • bicipital aponeurosis
46
Q

Floor of Cubital fossa

A 
Brachialis muscle (medially)
Supinator muscle( laterally)
47
Q

Contents of Cubital Fossa (from lateral to medial)

A
  • biceps tendons
  • brachial artery
  • median nerve

Muscles (9 decks)

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