What is a dermatome pattern?

Dermatomes are used to represent the patterns of sensory nerves that cover various parts of the body, include, head and neck, upper extremities (arms, hands, torso etc.), and lower extremities (hip, leg, foot, buttocks, feet, etc.)

What does Myotomal weakness indicate?

During myotome testing, you are looking for muscle weakness of a particular group of muscles. Results may indicate lesion to the spinal cord nerve root, or intervertebral disc herniation pressing on the spinal nerve roots.

What is Myotomal?

A myotome is the group of muscles that a single spinal nerve innervates. Similarly a dermatome is an area of skin that a single nerve innervates. In vertebrate embryonic development, a myotome is the part of a somite that develops into muscle.

Which cranial nerves are Myotomal?

The first group comprises of those supplying muscles derived from cranial myotomes, namely, the oculomotor (III), trochlear (IV), abducent (VI) that supply the eye muscles, and the hypoglossal (XII) supplying the tongue.

What is the L3 myotome?

The L3 dermatome is an area of skin that receives sensations through the L3 spinal nerve and includes the front part of the thigh and inner part of the leg. The L3 myotome is a group of muscles controlled by the L3 spinal nerve and includes parts of specific muscles in the hip, thigh, and leg.

What does the olfactory nerve innervate?

Olfactory nerve (CN I) Cranial nerve 1 is a special somatic afferent nerve which innervates the olfactory mucosa within the nasal cavity. It carries information about smell to the brain.

What are the olfactory nerves?

The olfactory nerve is a solely sensory nerve and conveys the sense of smell. Its receptors are located in the olfactory mucosa under the roof of the nasal cavity. The olfactory fibers cross the skull base through the olfactory foramina of the cribriform plate and enter the olfactory bulb in the olfactory groove.