Medial intermuscular septum
Encyclopedia
The medial intermuscular septum, thicker than the lateral intermuscular septum
, extends from the lower part of the crest of the lesser tubercle
of the humerus
below the Teres major, along the medial supracondylar ridge
to the medial epicondyle
; it is blended with the tendon of the Coracobrachialis, and affords attachment to the Triceps brachii behind and the Brachialis in front.
It is perforated by the ulnar nerve
, the superior ulnar collateral artery
, and the posterior branch of the inferior ulnar collateral artery
.
Lateral intermuscular septum
The lateral intermuscular septum extends from the lower part of the crest of the greater tubercle of the humerus, along the lateral supracondylar ridge, to the lateral epicondyle; it is blended with the tendon of the Deltoideus, gives attachment to the Triceps brachii behind, to the Brachialis,...
, extends from the lower part of the crest of the lesser tubercle
Lesser tubercle
The lesser tubercle of the humerus, although smaller, is more prominent than the greater tubercle: it is situated in front, and is directed medially and anteriorly....
of the humerus
Humerus
The humerus is a long bone in the arm or forelimb that runs from the shoulder to the elbow....
below the Teres major, along the medial supracondylar ridge
Medial supracondylar ridge
The inferior third of the medial border of the humerus is raised into a slight ridge, the medial supracondylar ridge , which becomes very prominent below; it presents an anterior lip for the origins of the Brachialis and Pronator teres, a posterior lip for the medial head of the Triceps brachii,...
to the medial epicondyle
Medial epicondyle
Medial epicondyle can refer to:* Medial epicondyle of the humerus * Medial epicondyle of the femur...
; it is blended with the tendon of the Coracobrachialis, and affords attachment to the Triceps brachii behind and the Brachialis in front.
It is perforated by the ulnar nerve
Ulnar nerve
In human anatomy, the ulnar nerve is a nerve which runs near the ulna bone. The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest unprotected nerve in the human body , so injury is common...
, the superior ulnar collateral artery
Superior ulnar collateral artery
The superior ulnar collateral artery , of small size, arises from the brachial a little below the middle of the arm; it frequently springs from the upper part of the a...
, and the posterior branch of the inferior ulnar collateral artery
Inferior ulnar collateral artery
The inferior ulnar collateral artery arises about 5 cm. above the elbow.-Course:It passes medialward upon the Brachialis, and piercing the medial intermuscular septum, winds around the back of the humerus between the Triceps brachii and the bone, forming, by its junction with the profunda brachii,...
.