Neck Flashcards
Anterior longitudinal ligament
Reinforces anterior discs, limits extension
Posterior longitudinal ligament
Reinforces posterior discs, limits flexion
Ligamentum nuchae = supraspinous ligament
Thicker than in thoracic/lumbar regions
Limits flexion
Interspinous/intertransverse ligaments
Limit flexion and rotation/limits lateral flexion
Ligamentum flavum
Attach lamina of one vertebrae to another, reinforces articular facets
Limits flexion and rotation
Whiplash
flexion on extension injury
Platysma
- Extends over front and side of neck
- Originates from subcutaneous tissue over the pectoralis major and deltoid and inserts on the lower border of the mandible and muscles around the mouth
- Depresses lower jaw and lip and angle of mouth, wrinkles skin of neck
External Jugular Veins
- Formed by joining of posterior auricular vein and retromandibular vein
- Inferior course, superficial to sternocleidomastoid
- Drain into subclavian vein
Anterior Jugular Veins
Drain anterior aspect of neck
Drain into subclavian vein
Anterolateral Neck Muscles
Sternocleidomastoid
Posterior Neck Muscles
Semispinalis capitis, Splenius capitis, Trapezius
Sternocleidomastoid Muscle
- divides neck into anterior and posterior triangles
- sternal & clavicular head insert onto mastoid process
Sternocleidomastoid Muscle innervation
Innervation is spinal accessory nerve (CN XI)
Sternocleidomastoid Muscle action
- Acting together, muscles flex cervical part of vertebral column
- Contraction of one muscle pulls ear down to tip of shoulder on same side and rotates head so that face looks upward to the opposite side
Bony and Cartilagenous Contents
- hyoid bone (C3 level)
- thyroid cartilage (C3/C4 level)
- cricoid cartilage (C5/C level)
- thyrohoid membrane
- cricothyroid membrane
Throhyoid membrane
Between hyoid bone and thyroid cartilage
Cricothyroid membrane
Between thyroid cartilage and cricoid cartilage
Larynx
Organ of voice production and part of respiratory tract between lower part of pharynx and trachea
Cartilages of larynx
thyroid cartilage
cricoid cartilage
epiglottis
Goiter
- enlargement of thryoid gland
- can compress structures such as: trachea, larynx and esophagus
- iodine deficiency
- treated with radioactive iodine
Part I of subclavian artery
vertebral artery
internal thoracic artery
thyrocervical trunk
Part II of subclavian arterty
costcocervical trunk
Part III of subclavian trunk
suprascapular artery
Anterior triangle boundaries
- anterior border of SCM
- midline of neck
- inferior border of manible
- roof=platysma and investing layer of deep cervical fascia
Stylohyoid muscle
styloid process to hyoid
Stylohyoid muscle innervation
CN VII
Stylohyoid muscle action
Elevates and retracts hyoid during swallowing; elongates floor of mouth
Digastric muscle
mandible to mastoid
Digastric muscle innervation
CN V3 and CN VIII
Digastric muscle action
Depresses mandible against resistance or elevates hyoid bone during swallowing or eating
Suprahyoid muscles
- stylohyoid
- digastric
- mylohyoid
- geniohyoid
Infrahyoid muscles
- omohyoid
- sternohyoid
- throhyoid
- sternothyroid
Omohyoid muscle
superior border of scapula to hyoid
-has 2 bellies connected by intermediate tendon attached to clavicle by fibrous sling
Omohyoid muscle innervation
C1-C3 ansa cervicalis
Omohyoid action
depresses and fixes hyoid
Sternohyoid muscle
manubrium and medial clavicle to hyoid bone
Sternohyoid innervation
C1-C3 ansa cervicalis