LECTURE 4: Neck Flashcards
What organs make up the neck?
bones, larynx, pharynx, muscles, thyroid and parathyroid
What bones make up the neck?
temporal bone (mastoid and styloid process), mandible, hyoid, clavicle, sternum, and cervical vertebrae
What is special about the Hyoid bone?
Only bone in the body that does not articulate with any other bone
What is the role of the Hyoid bone?
Serves as an anchor for muscles in the neck
What are the different parts of pharynx
a nasal pharynx, laryngeal pharynx, and oral pharynx because it connects all these structures ultimately leading down to the esophagus
What bones are the larynx connected to?
Suspended from hyoid bone above, continuous with trachea below
What are the 3 unpaired cartilages of the larynx?
Thyroid (Laryngeal prominence), Cricoid, and Epiglottis
What is the difference in the laryngeal prominence among sexes?
more prominent in men because men have a surge of testosterone making their voice deeper at puberty
What is the role of the epiglottis?
blocks the larynx while you’re eating so the food doesn’t get into your throat
What type of cartilage makes up the epiglottis?
elastic
What does the thyrohyoid connect?
connects thyroid cartilage to thyroid bone
What does the Cricothyroid connect?
connects cricoid to the thyroid cartilage above it
What is the role of the small paired cartilage muscles associated with the larynx?
They control the vocal cords to help us produce sound/pitch
What are the small paired cartilage muscles associated with the larynx?
Arytenoid, corniculate, cuneiform
What is the blood supply to the larynx?
Superior and inferior laryngeal artery
Where does the superior laryngeal artery arise from?
external carotid
What does the superior laryngeal artery supply?
supplies face and neck
Where does the inferior laryngeal artery arise from?
From thyrocervical trunk of subclavian artery
Where does the inferior laryngeal vein drain into?
Left brachiocephalic vein
What structures does the nasophraynx connect?
posterior to nasal cavity and contains connection to the inner/middle ear
What muscles form the wall of the pharynx?
constrictor and longitudinal muscles
What is the origin of the constrictor muscles?
midline raffi
What is the role of the constrictor and longitudinal muscles?
allow for up and down movement of hyoid bone and rhythmic movement for swallowing
What is the blood supply of the pharynx?
Ascending pharyngeal artery, and Branches of facial, lingual and maxillary artery from the external carotid
What is the venous drainage of the pharynx?
Plexus drains into internal jugular v.
What are the lympathics of the pharynx?
Retropharyngeal, Paratracheal and Infrahyoid nodes (underneath hyoid and neck)
What does the ascending pharyngeal artery supply?
superior aspect of pharynx
What is the nerve innervation to the pharynx?
Cranial nerves (Vagus, Glossopharyngeal)
What is the lymphatic drainage of the larynx?
deep cervical nodes
What is the innervation of the larynx?
cranial nerve (vagus)
What is the platysma?
Thin sheet of muscle that hangs over fascia of neck like an apron, and Attaches on the mandible
What is the role of the platysma?
Tenses up your neck
What is the innervation of the platysma?
cranial facial nerve
What is the attachment of the sternocleidomastoid muscle?
Mastoid process (behind ear) –> sternum and clavicle
What is the unilateral action of the sternocleidomastoid muscle?
lateral flexion to same side, rotation to opposite side
What is the bilateral action of the sternocleidomastoid muscle?
cervical flexion
What other roles does the sternocleidomastoid muscle serve?
Helps in forced inspiration
What is the nerve innervation of the sternocleidomastoid muscle?
Cranial nerve (Accessory)
What are the attachments of the scalenes?
Transverse processes of cervical vertebrae and run down to attach to the First two ribs
What is the bilateral action of the scalenes?
Assist in neck flexion, raise first 2 ribs
What other role does the scalene play?
Helps in forced inspiration
What is the nerve supply to the scalenes?
Ventral rami of cervical nerves
What sits on top of the scalene muscles?
Sternocleidomastoid
What is the origin of the sternocleidomastoid muscle on the clavicular head?
Medial 1/3 of clavicle
What is the origin of the sternocleidomastoid muscle on the sternal head?
Manubrium of sternum
What is the insertion of the sternocleidomastoid muscle?
Mastoid process
What are the 3 parts of the scalene muscles?
posteror, interior and middle
What is the origin of the scalene muscles?
Transverse processes C3- C7
What is the insertion of the middle and anterior scalene muscles?
Upper surface of rib 1
What is the insertion of the posterior scalene muscles?
Upper surface of rib 2
What is the action of the scalene muscles?
elevation of rib 1 (and 2 for posterior)
What are the various parts of the suprahyoid bone of the neck?
Stylohyoid –> styloid process and hyoid bone
Digastric –> 2 bellies (anterior and posterior)
Mylohyoid –> inferior mouth (chin)
Geniohyoid –> mouth
What are the various parts of the infrahyoid bone of the neck?
Sternohyoid –> sternum and hyoid
Omohyoid –> scapula
Thyrohyoid –> thyroid cartilage
Sternothyroid –> sternum and thyroid cartilage
What is the role of the stylohoid muscle?
pulls hyoid up during swallowing
What are the 2 components of the digastric muscle?
anterior and posterior belly
What is the role of the digastric muscle?
Raises hyoid or lowers mandible for swallowing; depends on which side is fixed
What is the role of the mylohyoid muscle?
Forms the entire floor of the mouth; elevates hyoid
what is the role of the geniohyoid muscle?
Elevates hyoid; pulls mandible down
What is is the anterior body wall supply of the root of the neck?
Internal thoracic artery
What does the vertebral artery supply?
Supplies brain via circle of Willis
What are theblood supplies to the root of the neck?
vertebral artery, internal thoracic artery, Thyrocervical and Costocervical
What is the blood supply to the head?
right and left common carotid artery, external and internal carotid artery
What does the external carotid artery supply?
Supplies the neck and face
What does the internal carotid artery supply?
Supplies brain (via circle of Willis)
What does the lingual artery supply?
Supplies tongue, tonsils, floor of mouth
What does the facial artery supply?
Major supply to the face
What does the maxillary artery supply?
Nasal cavity, roof of the oral cavity, upper teeth, sinuses, oropharynx and floor of the orbit
What does the superfical temporal artery supply?
supplies Skin around temporal bone
What does the superior thyroid artery supply?
supplies Thyroid gland
What does the internal jugular vein drain?
travels with the internal carotid artery and vagus nerve, and drains from the sinuses
o Drains superficial head and neck
What does the external jugular vein drain?
more lateral and drains head and neck
What does the anterior jugular vein drain?
gets superficial head and neck structures
What veins drain into the subclavian?
all the jugular veins
What does the superficial cervical nodes innervate?
Drain face and scalp; travels Along external jugular vein on surface of SCM
What does the deep cervical nodes innervate?
Drain tonsillar region and tongue
What separates the supper and lower deep cervical nodes?
tendon of omohyoid
What are the 4 cutaneous innervations of the neck?
Transverse Cervical nerve
Great Auricular nerve
Lesser Occipital nerve
Supraclavicular nerve.
What is the motor innervation of the infrahyoid muscle?
Ansa cervicalis
What innervates the diaphragm?
phrenic nerve
What innervated the tongue?
cranial nerve 12
What is the blood supply to the thyroid?
superior and inferior thyroid artery
Where is the superior thyroid artery from?
external carotid artery
Where is the inferior thyroid artery from?
subclavian artery
What are the venous drainage of the thyroid?
Superior, middle and inferior thyroid veins
What is the lymphatics of thyroid gland?
Pretracheal and deep cervical nodes
What is nodes innervate the thyroid gland?
Cranial nerve (Vagus) and Sympathetic trunk
What is the role of the parathyroid gland?
Serves to regulate calcium in our blood
What is the blood supply to the parathyroid gland?
Superior and Inferior thyroid arteries
What is the venous drainage of the parathyroid gland?
Superior, middle and inferior thyroid veins
What is the lymphatics of the parathyroid gland?
Cranial nerve (Vagus) and Sympathetic trunk