|
The coracoid bone is a bone in birds joining the sternum and shoulder-bone, and giving support to the wing. In mammals it is represented by the coracoid process of the scapula.
 Research Coracoid Bone
The biceps brachii (biceps flexor cubiti) is a two-headed arm muscle that consists of the long head (caput longum), and the short head (caput breve). The long head originates from the supraglenoid tuberosity of the scapula and the short head originates from the coracoid process. The muscle extends from the shoulder to the elbow where the biceps tapers into a flat, strong tendon that inserts in the tuberosity on the upper end of the radius. It is innervated by the musculocutaneous nerves (5th and 6th crevical nerves) and is supplied by branches of the brachial artery. This muscle is the main flexor of the elbow joint. When working with other nearby muscles, it can also move the shoulder, since its upper ends are attached to the scapula. In addition it can twist the lower arm so that the palm faces outward, a movement called supination. The biceps and the triceps work together to control the up and down movement of the forearm.
Research Biceps Brachii
The conoid ligament is part of the coracoacromial ligament which extends from the base of the coracoid process to the conoid tubercle on the underside of the clavicle. It is responsible for controlling and regulating the gliding motions of the clavicle and the sternum, especially of the back and forth rotation of the scapula.
Research Conoid Ligament
The coracobrachialis or 'Casser's perforated muscle' is the smallest muscle in the upper arm region. It originates from the coracoid process of the scapula and inserts in the medial border of the humerus. The coracobrachialis is innervated by the musculocutaneous nerve and supplied by the brachial artery. This muscle is a somewhat superficial muscle and can be partially seen on the inside of the upper arm near the arm pit when the arm is raised. It runs alongside, but separate from, the short head of the biceps brachii. It flexes and adducts the arm at the shoulder joint.
Research Coracobrachialis
The coracoid process of the scapula is a short projection of bone from the neck of the scapula. This process serves as a site of attachment for the coracoacromial and coracoclavicular ligaments, the pectoralis major, the coracobrachialis, and the short head of biceps.
Research Coracoid Process
The spine of the scapula is a ridge which runs laterally along the posterior surface of the bone. This spine separates the surface of the back of the scapula into two unequal areas: the supraspinous fossa and the infraspinous fossa. The spine continues laterally to form the coracoid process and the acromion (which articulates with the clavicle). The spine and these two projections serve to anchor much of the connective tissue in the shoulder. The trapezius and deltoid muscles are especially responsible for giving the scapula its stability and strength during movement.
Research Spine of the Scapula
|
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
|
|
|
Abbreviations
