Which cranial nerve carries motor signals to the sternocleidomastoid and the trapezius?
The accessory nerve
The vagus nerve enervates the gut (gastrointestinal tract), heart and larynx. The accessory nerve enervates the sternocleidomastoid muscles and the trapezius muscles.
What nerve supplies the sternocleidomastoid?
Accessory nerve (11th) This nerve supplies the sternocleidomastoid (SCM) and trapezius muscles, which can be tested as follows.
What nerve crosses the sternocleidomastoid?
The great auricular nerve crosses the sternocleidomastoid muscle and ascends toward the parotid gland, branching into dorsal and ventral rami that supply the skin in an area stretching from the angle of the mandible to the mastoid process and the skin of the neck.
Which of the following nerves Innervates the trapezius muscle?
The trapezius muscle is the most superficial and superior back muscle (see Fig. 4-1). It is a large, strong muscle that is innervated by the accessory nerve (cranial nerve XI).
What happens when cranial nerve 12 is damaged?
The hypoglossal nerve can be damaged at the hypoglossal nucleus (nuclear), above the hypoglossal nucleus (supranuclear), or interrupted at the motor axons (infranuclear). Such damage causes paralysis, fasciculations (as noted by a scalloped appearance of the tongue), and eventual atrophy of the tongue muscles.
What do each of the cranial nerves innervate?
Cranial nerves III, IV, VI, and XII (oculomotor, trochlear, abducens, and hypoglossal nerves) innervate skeletal muscles of the head. For example, nerve fibers of cranial nerves III, IV, and VI innervate muscles of the orbit. Nerve fibers of cranial nerves XII innervate the tongue.
What is cranial nerve XI?
The accessory spinal nerve or XI cranial nerve is essential for neck and shoulder movement, the intrinsic musculature of the larynx, and the sensitive afferences of the trapezius and sternocleidomastoid musculature.
What does the 12th cranial nerve do?
The Hypoglossal Nerve is the 12th Cranial Nerve (Cranial Nerve XII). It is mainly an efferent nerve for the tongue musculature. The nerve originates from the medulla and travels caudally and dorsally to the tongue.
What is cranial nerve XII?
What muscles are innervated by CN V3?
The only branch of the trigeminal nerve that has a motor component in the mandibular nerve (V3). This branch supplies motor innervation to the facial muscles involved in mastication which include the masseter, temporalis muscle, and the lateral and medial pterygoids.