2.1.3. Muscles of the Posterior (Extensor) Compartment of the Upper Arm Flashcards

1
Q

Where does the Arm extend:

  1. From?
  2. To?
A
  1. Shoulder

2. Elbow

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2
Q

What are the 2 Compartments of the Arm?

A
  1. Anterior (Flexor)

2. Posterior (Extensor)

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3
Q

What are the 2 Muscles of the Posterior (Extensor) Compartment?

A
  1. Triceps Brachii

2. Anconeus

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4
Q

What is the Arterial Supply to the Triceps Brachii?

A

Profunda Brachii Artery

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5
Q

How many Heads does the Triceps Brachii have?

A

3

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6
Q

What are the 3 Heads of the Triceps Brachii?

A
  1. Medial Head
  2. Lateral Head
  3. Long Head
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7
Q
  1. Which of the Heads of the Triceps Brachii sits Deepest?

2. Where do the other 2 sit?

A
  1. The Medial Head of the Triceps Brachii

2. They Lateral and Long Heads cover the Medial Head of the Triceps Brachii

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8
Q

Where does the Medial Head of the triceps Brachii originate from?

A

The Humerus, inferior to the Radial Groove

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9
Q

Where does the Lateral Head of the Triceps Brachii originate from?

A

The Humerus, superior to the Radial Groove

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10
Q

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

A

The Infraglenoid Tubercle

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11
Q

What happens to the Triceps Brachii as they converge?

A

They form one Tendon

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12
Q

Where does the Tendon of the Triceps Brachii attach Distally?

A

Olecranon of the Ulna

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13
Q

What is the function of the Triceps Brachii?

A

Extension of the Arm at the Elbow

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14
Q

What is the innervation of the Triceps Brachii?

A
  1. Radial Nerve

2. In some individuals, the Triceps Brachii are innervated by the Axillary Nerve

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15
Q

What is the Biceps Tendon Reflex testing?

A

C7

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16
Q

Where is the Anconeus located?

A

Medially and Superiorly to the Extensor Compartment of the Forearm

17
Q

What are the Fibres of the Anconeus blended with?

A

The Fibres of the Triceps Brachii (The two muscles can be indistinguishable)

18
Q

Where does the Anconeus originate from?

A

Lateral Epicondyle of the Humerus

19
Q

What does the Anconeus attach to distally?

A

Posterior and Lateral Part of the Olecranon

20
Q

What is the function of the Anconeus?

A
  1. Extends the Elbow Joint
  2. Stabilizes the Elbow Joint
  3. Abducts the Ulna during Pronation of the Forearm
21
Q

What is the innervation of the Anconeus?

A

Radial Nerve

22
Q

What does the Radial Nerve arise from?

A

It is the Terminal Branch Posterior Cord of the Brachial Plexus

23
Q

What is the function of the Radial Nerve?

A

It is the Nerve of the Extensor Compartment of the Forearm

24
Q

What does the Radial Nerve innervate?

A

All the Extensor Muscles of the Elbow and Wrist Joints

25
Q

How does the Radial Nerve enter into the Arm?

A

Anterior to the Long Head of the Triceps Brachii

26
Q
  1. What does the Radial Nerve travel alongside?

2. Where does the Radial Nerve travel?

A
  1. Profunda Brachii Artery (Deep Artery of the Arm)

2. Curves around the Midshaft Region of the Humerus, in the Radial Groove

27
Q

What is the Profunda Brachii Artery a Branch of?

A

Brachial Artery

28
Q

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

A
  1. C5
  2. C6
  3. C7
  4. T1
29
Q

Which Branch of the Brachial Artery accompanies the Radial Nerve in the Radial Groove?

A

Profunda Brachii

30
Q
  1. What is the Characteristic Clinical Sign of a Radial Nerve Injury?
A

Wrist Drop (due to this Nerve Supplying the Extensors of the E;bows and Wrists)