Human Movement Science & Functional Anatomy of the:

Coracobrachialis

by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, H/FS

By Anatomography (en:Anatomography (setting page of this image)) [CC BY-SA 2.1 jp (http://creativecommons.org/licenses/by-sa/2.1/jp/deed.en)], via Wikimedia Commons By Anatomography (http://creativecommons.org/licenses/by-sa/2.1/jp/deed.en)], via Wikimedia Commons

What’s in a name

  • Brachio – brachio- before a vowel, brachi-, word-forming element meaning “arm,” from Greek brakhion “arm,” perhaps originally “upper arm,” literally “shorter,” and from brakhys “short” (see brief (adj.)), in contrast to the longer forearm. (Etymology Online)
  • Coraco – New Latin coracoides, from Greek korakoeidēs, literally, like a raven, from korak-, korax raven  (Online Dictionary)

    • from shorter segment of arm to raven's beak shaped protrusion of the scapula

Created from Gray's Anatomy plate 411 using Gimp, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1595008 Created from Gray's Anatomy plate 411 using Gimp, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1595008

 

Attachments and Innervation:

  • Origin: Apex of the coracoid process (along with the tendon of the short head biceps brachii (3) of the scapula, and the intermuscular septum between the biceps brachii and coracobrachialis (8, 11, 20).
  • Insertion: Medial surface of the middle of the shaft of the humerus, opposite the deltoid tuberosity (11, 20).
  • Nerve: Musculocutaneous nerve, via the lateral cord of the brachial plexus, originating from nerve roots C6 and C7 (11). The musculocutaneous nerve innervates all of the anterior compartment muscles of the arm including the biceps brachii and brachialis.

flexor_compartment_of_arm1310956644688

Relative Location:

The coracobrachialis is an anterior compartment muscle, which arises from the apex of the coracoid process via a common (conjoined) tendon with the short head of the biceps brachii (3).  This attachment is abutted by the insertion of the pectoralis minor on the medial superior margin, and the attachment of the acromioclavicular ligament on the lateral superior (posterior) margin of the coracoid process. The origin and conjoined tendon are deep to