What is the origin of the Scalenus medius?
Origin and insertion The scalenus medius muscle is the largest and the longest of the scalenes. It originates from the transverse processes of axis (C2), transverse processes of atlas (C1), and the posterior tubercles of transverse processes of the vertebrae C3-C7.
What is the Scalenus muscle?
The scalene muscles are a group of three pairs of muscles in the lateral neck, namely the anterior scalene, middle scalene, and posterior scalene. They are innervated by the fourth, fifth, and sixth cervical spinal nerves (C4-C6).
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.
Where are Scalenes located?
The scalene muscles are located deep in relation to the sternocleidomastoid muscle, lateral to the cervical spine, connecting the vertebrae to the first two ribs. The deep fascia or prevertebral fascia envelop the scalene muscles.
Where is the posterior scalene?
The posterior scalene is the smallest and deepest of the scalene muscles. Unlike the anterior and middle scalene muscles, it inserts into the second rib. Attachments: Originates from the posterior tubercles of the transverse processes of C5-C7, and attaches into the second rib.
Where is the Scalenus muscle located?
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 the function of the Sternomastoid?
Function. Rotation of the head to the opposite side or obliquely rotate the head. It also flexes the neck. When acting together it flexes the neck and extends the head.
Where is the hyoid?
neck
The hyoid bone (hyoid) is a small U-shaped (horseshoe-shaped) solitary bone, situated in the midline of the neck anteriorly at the base of the mandible and posteriorly at the fourth cervical vertebra. Its anatomical position is just superior to the thyroid cartilage.
Where does the middle scalene muscle come from?
Middle scalene. The middle scalene arises from the posterior tubercles of the transverse processes of the lower six cervical vertebrae. It descends along the side of the vertebral column to insert by a broad attachment into the upper surface of the first rib, between the tubercle and the subclavian groove.
Where is the anterior scalene muscle located in the neck?
Anterior scaleneEdit. The anterior scalene muscle ( Latin: scalenus anterior ), lies deeply at the side of the neck, behind the sternocleidomastoid muscle. It arises from the anterior tubercles of the transverse processes of the third, fourth, fifth, and sixth cervical vertebrae, and descending, almost vertically, is inserted by a narrow,…
How are the scalene muscles used in respiration?
The anterior and middle scalene muscles lifts the first rib and bends the neck to the same side as the acting muscle; the posterior scalene lifts the second rib and tilts the neck to the same side. Because they elevate the upper ribs they also act as accessory muscles of respiration, along with the sternocleidomastoids .