Anatomy of the Triceps and Surrounding Musculature

Reflection of Lateral Head of the Triceps
- The lateral head of the triceps is initially located on the outer part of the arm and needs to be reflected back during dissection.
- Accessory Head of Triceps
- Positioned underneath (deep to) the lateral head of the triceps.
- Most notable during dissection when lateral head is reflected back, making it visible.
Location Reference
- When discussing placement:
- The medial aspect is the area that will be examined once the lateral head is flipped back.
- Key skeletal landmarks mentioned include:
  - Scapula
  - Situated throughout the presented area.
  - Humerus
  - The fumeris sets here, signifying the upper arm bone position.
  - Radius and Ulna
  - These lower arm bones come down from the elbow region.
Muscles to Identify
- Subscapularis
- Important muscle in the location being discussed; responsible for internal rotation of the shoulder joint.
- Biceps Brachii
- Positioned in the front of the upper arm; important for elbow flexion and shoulder elevation.
- Medial Head of the Triceps
- Located deeper than the lateral head, assists in arm extension.
- Brachialis
- Strong elbow flexor positioned underneath the biceps brachii.
- Long Head of the Triceps
- Visible on both the inside and outside of the humerus; runs along the back of the arm, contributes to arm extension.
- Latissimus Dorsi
- Not specifically mentioned for dissection but important in shoulder movement and stability.
- Supraspinatus
- Wraps around the shoulder joint; plays a crucial role in the initiation of arm abduction.
Preparation for Dissection
- The instructions emphasize the need to reflect the lateral head of the triceps to better visualize the accessory head and the surrounding musculature.