2.1.2. Muscles of the Anterior (Flexor) Compartment of the Upper Arm Flashcards
Where does the Arm extend:
- From?
- To?
- Shoulder
2. Elbow
What are the 2 Compartments of the Arm?
- Anterior (Flexor)
2. Posterior (Extensor)
What are the 3 Muscles of the Anterior (Flexor) Compartment?
- Biceps Brachii
- Coracobrachialis
- Brachialis
What innervates the Muscles of the Anterior (Flexor) Compartment?
The Musculocutaneous Nerve
What is the Arterial Supply for the Muscles of the Anterior (Flexor) Compartment?
Muscular Branches of the Brachial Artery
Which of the Muscles of the Anterior (Flexor) Compartment, is the most Anterior?
Biceps Brachii
How many heads does the Biceps Brachii have?
2
What are the 2 Heads of the Biceps Brachii?
- Long Head
2. Short Head
Where does the Long Head of the Biceps Brachii originate from?
Supraglenoid Tubercle of the Scapula
Where does the Short Head of the Biceps Brachii originate from?
Coracoid Process of the Scapula
Where is most of the Muscle Mass of the Biceps Brachii contained?
Anteriorly to the humerus
Is the Biceps Brachii attaches to the Humerus?
No
What happens to the tendon of the Biceps Brachii as it enters the Forearm?
A Connective Tissue Sheath is given off
What is the name of the Connective Tissue Sheath, given off as the Biceps Brachii Tendon enters the Forearm?
Bicipital Aponeurosis
What is the function of the Bicipital Aponeurosis?
Forms the Roof of the Cubital Fossa
What does the Bicipital Aponeurosis blend with?
The Deep Fascia of the Anterior Forearm
Where do the 2 Heads of the Biceps Brachii unite?
In the Distal 1/3 of the Upper Arm
Where does the Tendon of the Biceps Brachii attach Distally?
- Radial Tuberosity
2. Fascia of the Forearm (Via the Bicipital Aponeurosis)
What is the function of the Biceps Brachii?
- Supination of the Forearm
- Flexion of the Arm at the Elbow
- Flexion of the Arm at the Shoulder
What is the innervation of the Biceps Brachii?
Musculocutaneous Nerve
What is the Biceps Tendon Reflex testing?
C6
Where does the Coracobrachialis lie, in relation to the Biceps Brachii?
Deep
How is the Coracobrachialis described?
A Slender, Rounded Muscle
Where does the Coracobrachialis originate from?
Coracoid Process of the Scapula
Where does the Coracobrachialis travel?
Through the Axilla
Where does the Coracobrachialis attach to distally?
Medial Margin of the Humeral Shaft, at the level of the Deltoid Tubercle (About the Midline)
What is the function of the Coracobrachialis?
- Flexion of the Arm at the Shoulder
2. Weak Adduction of the Arm at the Shoulder
What is the innervation of the Coracobrachialis?
Musculocutaneous Nerve
Where does the Brachialis lie, in relation to the Biceps Brachii?
Deep
Where does the Brachialis lie, in relation to the Coracobrachialis?
Distally
How is the Brachialis described?
A Strong Muscle
Where does the Brachialis originate from?
Anterior, Medial and Lateral, Surfaces of the Distal Half of the Humeral Shaft
Where does the Brachialis muscle attach distally?
- The Coronoid Process of the Ulnar
2. The Ulnar Tuberosity (just Distal to the Elbow Joint)
What is the function of the Brachialis?
Flexion of the Elbow
What is the innervation of the Brachialis?
- Musculocutaneous Nerve
2. With Contribution from the Radial Nerve
What does the Musculocutaneous Nerve arise from?
The Lateral Cord of the Brachial Plexus
How does the Musculocutaneous Nerve enter into the Arm?
By Perforating the Coracobrachialis
Where does the Musculocutaneous Nerve travel?
It descends between the Biceps Brachii and Brachialis Muscles
What does the Musculocutaneous Nerve continue as?
Lateral Cutaneous Nerve of the Forearm
What is the Segmental (or Root) Value of the Musculocutaneous Nerve?
- C5
- C6
- C7
What are the Muscles Supplied by the Musculocutaneous Nerve?
- Biceps Brachii
- Coracobrachialis
- Brachialis
From which part of the Forearm does the Musculocutaneous Nerve carry Cutaneous Sensations?
The Lateral Part of the Forearm
Does the Musculocutaneous Nerve supply any Muscles in the Forearm / Hand?
No
