What Innervates Scalenus anterior?
The anterior vertebral muscles. They are innervated by the fourth, fifth, and sixth cervical spinal nerves (C4-C6). The anterior and middle scalene muscles lift the first rib and bend the neck to the same side; the posterior scalene lifts the second rib and tilts the neck to the same side.
What does Scalenus anterior do?
Function. The action of the anterior and middle scalene muscles is to elevate the first rib, they also flexes and laterally bends the neck to same side. The action of the posterior scalene is to elevate the second rib and tilt the neck to the same side.
What is Scalenus anterior muscle?
The anterior scalene, AKA scalenus anterior (scalenus anticus; Latin: musculus scalenus anterior) muscle is one of the lateral muscles of the neck, belonging to the scalene group. It is deeply placed, lying behind the Sternocleidomastoid. It is located between the subclavian vein and the subclavian artery.
What is the Scalenus medius?
Middle Scalene, AKA Scalenus Medius (Latin: musculus scalenus medius), is the largest and longest muscle in the scalene group of lateral neck muscles. Often penetrated by the dorsal scapular and long thoracic nerves, it is deeply placed, lying behind Sternocleidomastoid.
What is the Scalenus?
The scalene muscles are the three muscles found on each side of the neck, spanning between the transverse processes of the cervical vertebrae and the upper two ribs. They all belong to the lateral vertebral muscle group. The main functions of these muscles are flexion, lateral flexion and rotation of the neck.
What Innervates the Sternocleidomastoid?
The sternocleidomastoid is innervated by the accessory nerve. It is given the name sternocleidomastoid because it originates at the manubrium of the sternum (sterno-) and the clavicle (cleido-) and has an insertion at the mastoid process of the temporal bone of the skull.
What are the Scalenes innervated by?
The scalene muscles are innervated by the anterior branches of the cervical spinal nerves from C3 to C8. Scalene muscles involve the cervical plexus and the brachial plexus; the collaboration between the two complexes is fundamental for the different functions of these muscles.
What is the innervation of the scalene muscles?
What is the Sternohyoid?
The sternohyoid is a paired, flat strap of muscle that serves to fix the hyoid bone as well as depressing the larynx in phonation and in the terminal phase of swallowing.
Which cranial nerve innervates the sternocleidomastoid and trapezius?
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.
Where is the Scalenus anterior muscle located in the body?
Scalenus anterior muscle. The anterior scalene muscle runs from the anterior tubercula of the transverse processes of the 3rd to 6th cervical vertebrae to the first rib.
Where does the innervation of the Scalenus medius come from?
The innervation to the scalenus medius is delivered by the anterior rami of cervical spinal nerves C3-C8 . Just like the scalenus anterior, the scalenus medius receives its blood supply from the ascending cervical branch of the inferior thyroid artery . The contraction of the scalenus medius muscle produces strong ipsilateral flexion of the neck.
Where are the scalene muscles located in the neck?
The scalene muscles are a set of three muscles: the anterior scalene, the middle scalene and the posterior scalene. They are located in the posterior triangle of the neck. The scalene muscles originate from the transverse processes of cervical vertebrae and insert along the first and second ribs.
Is the Scalenus anterior part of the thoracic inlet?
The scalenus anterior (also known as anterior scalene) is a neck muscle and known as the “key” structure for the thoracic inlet as it is an important anatomical landmark. origin: transverse processes of 3 rd to 6 th cervical vertebrae.