Where does the trapezius obtain its innervation from?

Where does the trapezius obtain its innervation from?

Instead, motor innervation to the trapezius is conveyed by the accessory nerve (CN XI) as well as the anterior rami of the C3 and C4 spinal nerves, which also contain proprioceptive/sensory fibers from the muscle.

Which cranial nerve innervates the trapezius and sternocleidomastoid?

the XI nerve
The muscles innervated directly by the XI nerve are the trapezius and the sternocleidomastoid, in addition to the laryngeal musculature (in collaboration with the vagus nerve), such as the palatal, pharyngeal, laryngeal muscles.

What are the actions of the trapezius?

The trapezius muscle is a postural and active movement muscle, used to tilt and turn the head and neck, shrug, steady the shoulders, and twist the arms. The trapezius elevates, depresses, rotates, and retracts the scapula, or shoulder blade.

Which cranial nerve innervates the sternocleidomastoid and trapezius quizlet?

The spinal accessory nerve is a motor nerve that innervates the sternocleidomastoid and trapezius muscles.

Which head neck muscle is innervated by a cranial nerve?

Sternocleidomastoid and trapezius muscles are innervated by the lower part of cranial nerve XI (Standring, 2008).

What is neuronal innervation?

What is Innervation? Innervation means “to supply nerves” or “to supply with energy” or “to stimulate.” When nerves embed themselves into muscle fiber, they “innervate” the muscle fibers. [2] This event usually occurs in the neuromuscular junctions and can be identified as simple contractions.

What is the innervation of the trapezius muscle?

Anatomy of the Trapezius. Nerve innervation to the trapezius muscle is interesting, as it is served by a cranial nerve. This nerve, called the spinal accessory nerve, or cranial nerve XI, arises from your brain stem and travels from your skull down to the trapezius muscle, providing motor input.

Is the thyrohyoid muscle innervated by the ansa?

Thyrohyoid, unlike the other infrahyoid muscles, is not innervated by the ansa cervicalis. Instead, nerve fibers from the anterior rami of the first cervical spinal nerve (C1) reach the muscle via the hypoglossal nerve (CN XII).

Where does the nerve reach the thyrohyoid muscle?

Instead, nerve fibers from the anterior rami of the first cervical spinal nerve (C1) reach the muscle via the hypoglossal nerve (CN XII). This nerve (often simply referred to as the nerve to thyrohyoid) branches from CN XII near the posterior border of hyoglossus.

How is the trapezius muscle related to the scapula?

The trapezius muscle also functions to stabilize the scapula when you carry something at your side, such as a bag of groceries. Because of the large size of the trapezius muscle, this muscle is innervated by more than one nerve. Specifically, the trapezius nerve receives electrical impulses from the brain through the following nerves: