What is the function of trochlear notch?
The articulation of the humeral trochlea and the trochlear notch of the ulna is the major facilitator of flexion and extension about the elbow. The radiocapitellar articulation supports motion in both the flexion and extension of the elbow in addition to supination and pronation of the forearm.
Which bones have trochlear ridges?
The trochlear notch (/ˈtrɒklɪər/), also known as semilunar notch and greater sigmoid cavity, is a large depression in the upper extremity of the ulna that fits the trochlea of the humerus (the bone directly above the ulna in the arm) as part of the elbow joint….
|Anatomical terms of bone|
Where is semilunar notch?
The upper end of the ulna presents a large C-shaped notch—the semilunar, or trochlear, notch—which articulates with the trochlea of the humerus (upper arm bone) to form the elbow joint.
What structures make up the trochlear notch?
The trochlear notch (semilunar notch, greater sigmoid cavity) is a large depression, formed by the olecranon and the coronoid process, and serving for articulation with the trochlea of the humerus.
What is trochlea made of?
The trochlea of superior oblique is a pulley-like structure in the eye. The tendon of the superior oblique muscle passes through it. Situated on the superior nasal aspect of the frontal bone, it is the only cartilage found in the normal orbit. The word trochlea comes from the Greek word for pulley.
Where is the trochlear bone?
The superior surface of the talus is also known as the trochlear surface. In the ocular orbit, trochlea is a fibrous cartilaginous pully like structure on the nasal aspect of the frontal bone through which superior oblique muscle passes.
Which bone does the trochlea belong to?
The lower end of the humerus includes two smooth articular surfaces (capitulum and trochlea), two depressions (fossae) that form part of the elbow joint, and two projections (epicondyles). The capitulum laterally articulates with the radius; the trochlea, a spool-shaped surface, articulates with the ulna.
Are the radius and ulna connected?
The radius and ulna are connected by a sheet of thick fibrous tissue called the interosseous ligament or the interosseous membrane. A smaller ligament connects the proximal ends of the radius and ulna.
Where is trochlea located?
In the human arm, the humeral trochlea is the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm.
What is the trochlear notch of ulna?
The trochlear notch is the large, jaw-like curvature of the proximal ulna that articulates with the trochlea (of the humerus), forming the humeroulnar joint (Fig. 5.6). The inferior tip of the trochlear notch comes to a point, forming the coronoid process.
What is the trochlear?
The trochlear nerve is one of 12 sets of cranial nerves. It enables movement in the eye’s superior oblique muscle. This makes it possible to look down. The nerve also enables you to move your eyes toward your nose or away from it.