2.1.3. Muscles of the Posterior (Extensor) 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 2 Muscles of the Posterior (Extensor) Compartment?
- Triceps Brachii
2. Anconeus
What is the Arterial Supply to the Triceps Brachii?
Profunda Brachii Artery
How many Heads does the Triceps Brachii have?
3
What are the 3 Heads of the Triceps Brachii?
- Medial Head
- Lateral Head
- Long Head
- Which of the Heads of the Triceps Brachii sits Deepest?
2. Where do the other 2 sit?
- The Medial Head of the Triceps Brachii
2. They Lateral and Long Heads cover the Medial Head of the Triceps Brachii
Where does the Medial Head of the triceps Brachii originate from?
The Humerus, inferior to the Radial Groove
Where does the Lateral Head of the Triceps Brachii originate from?
The Humerus, superior to the Radial Groove
Where does the Long Head of the Triceps Brachii originate from?
The Infraglenoid Tubercle
What happens to the Triceps Brachii as they converge?
They form one Tendon
Where does the Tendon of the Triceps Brachii attach Distally?
Olecranon of the Ulna
What is the function of the Triceps Brachii?
Extension of the Arm at the Elbow
What is the innervation of the Triceps Brachii?
- Radial Nerve
2. In some individuals, the Triceps Brachii are innervated by the Axillary Nerve
What is the Biceps Tendon Reflex testing?
C7