What is the trochlea of eye?
Description. The trochlea of superior oblique is a pulley 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.
Is trochlea a bone eye?
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….
| Trochlea of superior oblique | |
|---|---|
| FMA | 49065 |
| Anatomical terminology |
What does Trochlear supply?
The trochlear nerve provides motor supply to the superior oblique muscle of the eye, The trochlear nerve carries axons of type GSE, general somatic efferent, which innervate skeletal muscle of the superior oblique muscle.
Where is your trochlea?
The trochlea is a saddle-like cartilaginous structure in the superior and medial region of the orbita, which contains the tendon of the superior oblique muscle.
What is Trochlear fovea?
The trochlear fovea is a slight depression on the anteromedial orbital surface of the orbital plate of the frontal bone. Attached to the trochlear fovea is the trochlea of the superior oblique muscle.
What is trochlear?
Introduction. The trochlear nerve is the fourth cranial nerve (CN IV) and one of the ocular motor nerves that controls eye movement. The trochlear nerve, while the smallest of the cranial nerves, has the longest intracranial course as it is the only nerve to have a dorsal exit from the brainstem.
What does Trochlear nucleus do?
The trochlear nucleus (cranial nerve IV) supplies most of its motor neurons to the contralateral superior oblique muscle, and supplies only 10% of its motor neurons to the ipsilateral muscle.
What is the function of the 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.
What is Trochlear?
Where is the Trochlear notch?
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. It is formed by the olecranon and the coronoid process.
Where is trochlea found?
elbow joint
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 does the trochlea articulate with?
The capitulum laterally articulates with the radius; the trochlea, a spool-shaped surface, articulates with the ulna.
What is trochlea in eye?
Trochlea is a cartilagineous structure acting as a pulley for the superior oblique muscle of the eye. It inserts on the trochlear fovea and spine located on anteromedial part of the orbital roof.
What muscle passes through trochlea?
Trochlea is a cartilagineous structure acting as a pulley for the superior oblique muscle of the eye. It inserts on the trochlear fovea and spine located on anteromedial part of the orbital roof. The tendon of superior oblique muscle passes through it 1.
Where does the trochlear nerve cross the eye socket?
Finally, the trochlear nerve reaches the eye socket and passes above a ring of muscles called the extraocular muscles. It then crosses the roof of the eye socket and connects to the superior oblique muscle. 3.
How does the trochlear nerve transmit sensory signals?
The trochlear nerve doesn’t transmit sensory signals. It functions purely as a motor nerve. The one muscle it sends signals to—the superior oblique muscle—is one of six muscles that allow the eye to make precise movements for tracking or focusing on an object. This muscle moves the eyeball up and down and left and right.