|Origin||anterior surface of the humerus, particularly the distal half of this bone|
|Insertion||coronoid process and the tuberosity of the ulna|
|Artery||radial recurrent artery, brachial artery|
|Nerve||musculocutaneous nerve (C5-C7) and radial nerve (C5, C6)|
|Actions||flexion at elbow joint|
|Anatomical terms of muscle|
The brachialis (brachialis anticus), also known as the Teichmann muscle, is a muscle in the upper arm that flexes the elbow. It lies deeper than the biceps brachii, and makes up part of the floor of the region known as the cubital fossa (elbow pit). The brachialis is the prime mover of elbow flexion generating about 50% more power than the biceps.
The brachialis originates from the anterior surface of the distal half of the humerus, near the insertion of the deltoid muscle, which it embraces by two angular processes. Its origin extends below to within 2.5 cm of the margin of the articular surface of the humerus at the elbow joint. Its fibers converge to a thick tendon, which is inserted into the tuberosity of the ulna and the rough depression on the anterior surface of the coronoid process of the ulna.
The brachialis is supplied by muscular branches of the brachial artery and by the recurrent radial artery.
The brachialis muscle is innervated by the musculocutaneous nerve, which runs on its superficial surface, between it and the biceps brachii. However, in 70-80% of people, the muscle has double innervation with the radial nerve (C5-T1). The divide between the two innervations is at the insertion of the deltoid.
The brachialis muscle In classical Latin bracchialis means of or belonging to the arm, and is derived from classical Latin bracchium,"arm". The expression musculus brachialis is used in the current official anatomic nomenco Terminologia Anatomica.
Horizontal section through the middle of upper arm. (Brachialis labeled at center left.)
- Saladin, Kenneth S, Stephen J. Sullivan, and Christina A. Gan. Anatomy & Physiology: The Unity of Form and Function. 2015. Print.
- Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. p. 662,672. ISBN 978-0-8089-2306-0.
- "Brachialis." UW Department of Radiology. University of Washington, Nov. 2005
- "Brachialis Muscle." Kenhub. Kenhub, Aug. 2001
- Di J.H. (Ed.) (1997).Stedman’s concise me10b">Triepel, H. (1910). Die anatomischen Namen. Ihre Ableitung und Aussprache. Mit eitte Auflage). Wiesbaden: Verlag J.F. Bergmann.
- Lewis, C.T. & Short, C. (1879). A Latin dictionary founded on Andrews' edition of Freund's Latin dictionary. Oxford: Clarendon Press.
- Federative Committee on Anatomical Terminology (FCAT) (1998). Terminologia Anatomica. Stuttgart: Thieme
- Illustration: brachialis from The Department of Radiology at the University of Washington