出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/05/20 01:59:24」(JST)
| Brachialis | |
|---|---|
|
Deep muscles of the chest and front of the arm, with the boundaries of the axilla. (Brachialis visible at bottom right.)
|
|
|
Position of brachialis (shown in red).
|
|
| Details | |
| 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 |
| Nerve | musculocutaneous nerve (C5, C6) |
| Actions | flexion at elbow joint |
| Identifiers | |
| Latin | musculus brachialis |
| Dorlands /Elsevier |
m_22/12548498 |
| TA | A04.6.02.018 |
| FMA | 37667 |
| Anatomical terms of muscle
[edit on Wikidata]
|
|
The brachialis (brachialis anticus) is a muscle in the upper arm that flexes the elbow joint. It lies deeper than the biceps brachii, and is a synergist that assists the biceps brachii in flexing at the elbow. It makes up part of the floor of the region known as the cubital fossa.
The brachialis originates from the lower half of the front 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. It also arises from the intermuscular septa of the arm, but more extensively from the medial than the lateral; it is separated from the lateral below by the brachioradialis and extensor carpi radialis longus muscles.
Its fibers converge to a thick tendon, which is inserted into the tuberosity of the ulna[1] and the rough depression on the anterior surface of the coronoid process of the ulna.
The muscle is occasionally doubled; additional nip to the supinator, pronator teres, biceps brachii, lacertus fibrosus, or radius are more rarely found.
The brachialis muscle is innervated by the musculocutaneous nerve, which runs on its superficial surface, between it and the biceps brachii.[1] Part of it is also innervated by the radial nerve (proprioceptive branch) which allows it to be split during certain approaches to the arm. The divide between the two innervations is at the insertion of the deltoid.
The brachialis flexes the arm at the elbow joint.[1] Unlike the biceps, the brachialis does not insert on the radius, and does not participate in pronation and supination of the forearm.[1]
The brachialis muscle [2] and brachial muscle [3] can be considered as the anglicized variant of the Latin expression musculus bracchialis.[4] In classical Latin bracchialis means of or belonging to the arm,[5] and is derived from classical Latin bracchium,"arm".[5] The expression musculus brachialis is used in the current official anatomic nomenclature Terminologia Anatomica.[6]
Position of brachialis (shown in red). Animation.
Still image.
Horizontal section through the middle of upper arm. (Brachialis labeled at center left.)
Muscles of lower limb, including insertion of brachialis tendon. Cross section. (Brachialis labeled at bottom left.)
Left humerus. Anterior view.
Bones of left forearm. Anterior aspect.
Nerves of the left upper extremity.
Brachialis muscle (labeled in green text)
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
| Wikimedia Commons has media related to Brachialis muscles. |
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.
| リンク元 | 「上腕筋」 |
| 関連記事 | 「brachial」「muscle」 |