What is supinator crest of ulna?
su·pi·na·tor crest (of ulna) the proximal part of the interosseous border of the ulna from which a portion of the supinator muscle takes origin. Synonym(s): crista musculi supinatoris ulnae [TA], crest of supinator muscle.
In which bone supinator crest is present?
Supinator muscle curls around the proximal part of radius, connecting it with the ulna. In doing so, the muscle crosses the sagittal axis of forearm….Supinator muscle.
| Origin | Lateral epicondyle of humerus, radial collateral ligament, annular ligament, supinator crest of ulna |
|---|---|
| Action | Proximal radioulnar joint: Forearm supination |
What inserts on supinator crest?
On the upper part of the posterior surface is an oblique ridge, the supinator crest, which runs from the dorsal end of the radial notch, downward to the dorsal border; the triangular surface above this ridge receives the insertion of the Anconæus, while the upper part of the ridge affords attachment to the Supinator.
Where is the origin of the supinator?
Origin. The supinator muscle has a broad origin from the ulna and humerus. The two layers of fibres originate in common from the supinator crest of the ulna, the lateral epicondyle of the humerus, the radial collateral ligament and the annular radial ligament.
Where is the crest of the ulna?
The interosseous border (or crest) is the sharpest border on the ulna. It lies opposite the radius, on the lateral aspect of the ulnar shaft between the anterior and posterior surfaces.
What is the origin and insertion of the supinator?
An origin is a muscular attachment site to bone that is non-mobile. The supinator muscle originates on three different bones: the humerus, radius, and ulna. An insertion is a muscular attachment site to bone that is mobile. The supinator muscle inserts on the lateral, posterior, and anterior surfaces of the radius.
What does it mean to Supinate the forearm?
Definition of supination 1 : rotation of the forearm and hand so that the palm faces forward or upward also : a corresponding movement of the foot and leg in which the foot rolls outward with an elevated arch. 2 : the position resulting from supination.
What is the prime mover of supination?
The results suggest that the ECRB acts as a stabiliser to the forearm flexors for gripping during pronation torques depending on forearm angle, but acts as a prime mover in wrist extension for supination torques with little effect of elbow and forearm angle.
Does the ulna move in pronation and supination?
The ulna slightly abducts during pronation and adducts during supination. Variations has been described but normal forearm rotation averages about 75 degrees pronation and 85 degrees supination (Morrey and An, 2009).
What two muscles Supinate the forearm?
Supination is mainly facilitated by supinator and biceps brachii muscles.
What is Supinate arm?
su·pi·na·tion of the fore·arm rotation of the forearm in such a way that the palm of the hand faces anteriorly in the anatomical position, or upward when the arm is extended at a right angle to the body.