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-MSK Upper Limb Anatomy > 2.1.2. Muscles of the Anterior (Flexor) Compartment of the Upper Arm > Flashcards

2.1.2. Muscles of the Anterior (Flexor) Compartment of the Upper Arm Flashcards

1
Q

What are the 2 Compartments of the Arm?

A
  1. Anterior (Flexor)

2. Posterior (Extensor)

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2
Q

What are the 3 Muscles of the Anterior (Flexor) Compartment?

A
  1. Biceps Brachii
  2. Coracobrachialis
  3. Brachialis
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3
Q

What innervates the Muscles of the Anterior (Flexor) Compartment?

A

The Musculocutaneous Nerve

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4
Q

What is the Arterial Supply for the Muscles of the Anterior (Flexor) Compartment?

A

Muscular Branches of the Brachial Artery

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5
Q

Which of the Muscles of the Anterior (Flexor) Compartment, is the most Anterior?

A

Biceps Brachii

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6
Q

How many heads does the Biceps Brachii have?

A

2

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7
Q

What are the 2 Heads of the Biceps Brachii?

A
  1. Long Head

2. Short Head

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8
Q

Where does the Long Head of the Biceps Brachii originate from?

A

Supraglenoid Tubercle of the Scapula

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9
Q

Where does the Short Head of the Biceps Brachii originate from?

A

Coracoid Process of the Scapula

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10
Q

Where is most of the Muscle Mass of the Biceps Brachii contained?

A

Anteriorly to the humerus

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11
Q

Is the Biceps Brachii attaches to the Humerus?

A

No

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12
Q

What happens to the tendon of the Biceps Brachii as it enters the Forearm?

A

A Connective Tissue Sheath is given off

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13
Q

What is the name of the Connective Tissue Sheath, given off as the Biceps Brachii Tendon enters the Forearm?

A

Bicipital Aponeurosis

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14
Q

What is the function of the Bicipital Aponeurosis?

A

Forms the Roof of the Cubital Fossa

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15
Q

What does the Bicipital Aponeurosis blend with?

A

The Deep Fascia of the Anterior Forearm

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16
Q

Where do the 2 Heads of the Biceps Brachii unite?

A

In the Distal 1/3 of the Upper Arm

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17
Q

Where does the Tendon of the Biceps Brachii attach Distally?

A
  1. Radial Tuberosity

2. Fascia of the Forearm (Via the Bicipital Aponeurosis)

18
Q

What is the function of the Biceps Brachii?

A
  1. Supination of the Forearm
  2. Flexion of the Arm at the Elbow
  3. Flexion of the Arm at the Shoulder
19
Q

What is the innervation of the Biceps Brachii?

A

Musculocutaneous Nerve

20
Q

What is the Biceps Tendon Reflex testing?

A

C6

21
Q

Where does the Coracobrachialis lie, in relation to the Biceps Brachii?

A

Deep

22
Q

How is the Coracobrachialis described?

A

A Slender, Rounded Muscle

23
Q

Where does the Coracobrachialis originate from?

A

Coracoid Process of the Scapula

24
Q

Where does the Coracobrachialis travel?

A

Through the Axilla

25
Q

Where does the Coracobrachialis attach to distally?

A

Medial Margin of the Humeral Shaft, at the level of the Deltoid Tubercle (About the Midline)

26
Q

What is the function of the Coracobrachialis?

A
  1. Flexion of the Arm at the Shoulder

2. Weak Adduction of the Arm at the Shoulder

27
Q

What is the innervation of the Coracobrachialis?

A

Musculocutaneous Nerve

28
Q

Where does the Brachialis lie, in relation to the Biceps Brachii?

A

Deep

29
Q

Where does the Brachialis lie, in relation to the Coracobrachialis?

A

Distally

30
Q

How is the Brachialis described?

A

A Strong Muscle

31
Q

Where does the Brachialis originate from?

A

Anterior, Medial and Lateral, Surfaces of the Distal Half of the Humeral Shaft

32
Q

Where does the Brachialis muscle attach distally?

A
  1. The Coronoid Process of the Ulnar

2. The Ulnar Tuberosity (just Distal to the Elbow Joint)

33
Q

What is the function of the Brachialis?

A

Flexion of the Elbow

34
Q

What is the innervation of the Brachialis?

A
  1. Musculocutaneous Nerve

2. With Contribution from the Radial Nerve

35
Q

What does the Musculocutaneous Nerve arise from?

A

The Lateral Cord of the Brachial Plexus

36
Q

How does the Musculocutaneous Nerve enter into the Arm?

A

By Perforating the Coracobrachialis

37
Q

Where does the Musculocutaneous Nerve travel?

A

It descends between the Biceps Brachii and Brachialis Muscles

38
Q

What does the Musculocutaneous Nerve continue as?

A

Lateral Cutaneous Nerve of the Forearm

39
Q

What is the Segmental (or Root) Value of the Musculocutaneous Nerve?

A
  1. C5
  2. C6
  3. C7
40
Q

What are the Muscles Supplied by the Musculocutaneous Nerve?

A
  1. Biceps Brachii
  2. Coracobrachialis
  3. Brachialis
41
Q

From which part of the Forearm does the Musculocutaneous Nerve carry Cutaneous Sensations?

A

The Lateral Part of the Forearm

42
Q

Does the Musculocutaneous Nerve supply any Muscles in the Forearm / Hand?

A

No

-MSK Upper Limb Anatomy (48 decks)

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