Trochlear

Trochlear

Trochlear (pronunciation: trok-lee-er) is a term used in anatomy, specifically in the context of the human body. It is derived from the Latin word "trochlea", meaning "pulley".

Etymology

The term "trochlear" is derived from the Latin word "trochlea", which translates to "pulley". This is in reference to the pulley-like structure that the trochlear nerve wraps around in the human body.

Definition

The term "trochlear" can refer to several different aspects within the human body, all of which are related to the concept of a pulley-like structure.

1. Trochlear Nerve: The trochlear nerve is the fourth cranial nerve (CN IV) of the twelve cranial nerves. It controls the superior oblique muscle of the eye, which is responsible for downward and inward eye movements.

2. Trochlear Notch: The trochlear notch is a large depression in the ulna bone of the forearm that forms a joint with the humerus bone of the upper arm.

3. Trochlear Surface: The trochlear surface is a smooth, grooved articular surface seen on certain bones, such as the femur in the knee joint.

Related Terms

• Cranial Nerves: The cranial nerves are a set of twelve paired nerves that arise directly from the brain. The trochlear nerve is the fourth of these.

• Superior Oblique Muscle: This is the muscle in the eye that the trochlear nerve controls.

• Ulna: The ulna is one of the two bones in the forearm. The trochlear notch is a feature of this bone.

• Humerus: The humerus is the bone in the upper arm that forms a joint with the trochlear notch of the ulna.

• Femur: The femur is the thigh bone, which has a trochlear surface at the knee joint.

See Also

• Anatomy
• Cranial Nerves
• Human Skeleton

External links

• Medical encyclopedia article on Trochlear
• Wikipedia's article - Trochlear

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