Introduction to the Clavicle Bone

Overview

This lecture covers the anatomical position of the clavicle bone, its ends, shaft features, and main attachments.

Identification and Position of the Clavicle Bone

• The clavicle has two ends: medial (broad) and lateral (flat).
• The medial end attaches to the manubrium of the sternum.
• The lateral end connects to the acromion process of the scapula.
• The clavicle is the only long bone placed horizontally.
• It does not have a medullary cavity.
• It forms by membranous-cartilaginous ossification.

Parts and Surfaces of the Clavicle Bone

• Divided into medial two-thirds and lateral one-third.
• The lateral one-third has two surfaces: superior (smooth) and inferior.
• The medial part has four surfaces: superior, inferior, interior (convex), posterior (concave).

Major Features and Attachments

• On the inferior surface, trapezoid ridge and conoid tubercle are found, where the coracoclavicular ligament attaches.
• The costal tubercle attaches the costoclavicular ligament.
• The subclavian groove attaches the subclavius muscle.
• The interior surface attaches the pectoralis major muscle.
• The posterior surface (concave) attaches the sternohyoid muscle.

Key Terms & Definitions

• Clavicle — a horizontal long bone connecting the chest and shoulder.
• Medial End — the inner and broad end of the clavicle.
• Lateral End — the outer and flat end of the clavicle.
• Trapezoid Ridge — an oblique line on the inferior surface for ligament attachment.
• Conoid Tubercle — a raised part of the bone for ligament attachment.
• Costal Tubercle — medial inferior part for ligament attachment.
• Subclavian Groove — a groove on the inferior surface for muscle attachment.

Action Items / Next Steps

• Download the clavicle bone chart from the Instagram ID (link provided in the description).
• Revise all attachments of the clavicle for the next lecture.