# What is the bones of the upper extremity. 1. the clavicle?

The ossa extremitatis superioris is called the bones of the upper extremity. 1. the clavicle. Gray’s Anatomy (1918) describes it as follows: & (Clavicula; Collar Bone) The clavicle forms the anterior portion of the shoulder girdle.

## What it means

- & (Clavicula; Collar Bone) The clavicle forms the anterior portion of the shoulder girdle. It is a long bone, curved somewhat like the italic letter f, and placed nearly horizontally at the upper and anterior part of the thorax, immediately above the first rib. It articulates medially with the manubrium sterni, and laterally with the acromion of the scapula. 52 It presents a double curvature, the convexity being directed forward at the sternal end, and the concavity at the scapular end.
- Its lateral third is flattened from above downward, while its medial two-thirds is of a rounded or prismatic form. Lateral Third. —The lateral third has two surfaces, an upper and a lower; and two borders, an anterior and a posterior. Surface. —The upper surface is flat, rough, and marked by impressions for the attachments of the Deltoideus in front, and the Trapezius behind; between these impressions a small portion of the bone is subcutaneous. The under surface is flat.
- At its posterior border, near the point where the prismatic joins with the flattened portion, is a rough eminence, the coracoid tuberosity ( conoid tubercle ); this, in the natural position of the bone, surmounts the coracoid process of the scapula, and gives attachment to the conoid ligament. From this tuberosity an oblique ridge, the oblique or trapezoid ridge, runs forward and lateralward, and afford attachment to the trapezoid ligament.

## Sources

- [Gray's Anatomy of the Human Body (1918)](https://www.bartleby.com/lit-hub/anatomy-of-the-human-body/6a-the-bones-of-the-upper-extremity-1-the-clavicle/)

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