The Neck. . The neck (L. collum , cervix ) is the transitional area between the head superiorly and the clavicles inferiorly that joins the head to the trunk and limbs. 2 . It serves as a major passage for structures passing between them.
. The neck (L. collum, cervix) is the transitional area between the head superiorly and the clavicles inferiorly that joins the head to the trunk and limbs.
2. It serves as a major passage for structures passing between them.
3. In addition, several important organs with unique functions are located here: the larynx and the thyroid and parathyroid glands, for example.
Layers of deep cervical fascia: investing layer, pretracheal, prevertebral and carotid sheath
Begin: just behind angle of the mandible by union of posterior auricular vein and post.division of the retromandibular vein
2. ant. Jugular veinImportant veins1. external jugular vein
Begin: as contiuation of sigmoid sinus and leave skull throught jugular foramen
1. facial vein
2. Lingual vein
3. Pharyngeal vein
4. Thyroid veinsImportant veins2. internal jugular vein
a) Sternal head: Rounded and tendinous from front of manubrium.
b) Clavicular head: Thin and fleshy from upper surface of med. ⅓ of
Mastoid process and lateral ⅓ of the superior nuchal line.
1- Unilateral contraction → directs the face to opposite side.
2- Bilateral contraction → tilt the head backwards.
Nerve Supply : → spinal accessory n.
* Injury to the muscle leads to it contracture and shortening → Torticollis.
The oblique position of the sternomastoid divides the side of the neck into anterior and posterior triangle.Sternomastoid muscle
Origin :transverse processes of cervical vertebrae .
Insertion :first and second ribs .
1- Lateral flexion of neck .
2- Fixation of ribs during forced inspiration .
Nerve supply :
cervical and brachial plexuses .
. The subclavian vein passes infront the of scalenus anterior
. The subclavian artery and brachial plexus pass between scalenus anterior and scalenusmedius .