Head/Neck Flashcards
Layers of the scalp
SCALP: Skin Connective Tissue Aponeurosis Loose Connective Tissue (blood supply) Percranium
What are the 3 branches of the trigeminal nerve and what part of the face do they innervate?
Ophthalmic nerve (V1) - superior face
Maxillary nerve (V2) - middle face
Mandibular nerve (V3) - inferior face
The trigeminal nerve provides what kind of innervation?
Sensory
Which branch of the trigeminal is the only one to provide motor innervation?
Mandibular nerve (V3) to mastication muscles
Provide sensation to the back of the neck/head
Posterior rami of C2-C4
Provide sensation to the anterior/lateral neck
Anterior rami of C2-C4
4 muscles of mastication
Temporalis
Masseter
Lateral pterygoid
Medial pterygoid
Action of temporalis
Elevate and retract mandible
Innervation of temporalis
CN V
Blood supply of temporalis
Maxillary Artery
Action of masseter
Elevate mandible
Blood supply of masseter
Maxillary artery
Innervation of masseter
CN V
Action of lateral pterygoid
Protraction and lateral movements
Innervation of lateral pterygoid
CN V
Innervation of medial pterygoid
CN V
Blood supply of lateral pterygoid
Maxillary artery
Blood supply of medial pterygoid
Maxillary artery
Action of medial pterygoid
Elevate mandible
What does the corneal reflex test?
CN V1 and CN VII
What are the branches of CN VII (facial nerve)? What kind of sensation do they provide?
Temporal branches Zygomatic branches Buccal branches Marginal mandibular branches Cervical branches
Motor innervation
What passes through the parotid gland?
- 5 branches of the facial nerve (CN VII)
- retromandibular vein
- external carotid artery
What emerges anteriorly from the parotid gland?
- 5 branches of the facial nerve
- parotid duct
- transverse facial artery
What emerges superiorly from the parotid gland?
Superficial temporal artery and vein (can palpate)
What two gland produce spit?
Submandibular gland
Sublingual gland
What are the branches of the external carotid, inferior to superior?
Lingual artery Facial artery Maxillary artery (with the buccal artery branching off) Superficial temporal artery Transverse facial artery
What are the 4 sinuses in the cranial bones?
Frontal
Ethmoidal
Maxillary
Sphenoidal
What is the arterial supply to the nasal cavity?
Maxillary artery
Facial artery
Ethmoidal artery
What is the venous drainage of the nasal cavity?
Sphenopalantine vein
Facial vein
Ophthalmic vein
Anterior innervation of the nasal cavity
CN V1
Posterior innervation of the nasal cavity
CN V2
Superior innervation of the nasal cavity
Olfactory nerve (CN I)
What is a unique structure location in the nasopharynx?
Pharyngotympanic tube
4 types of teeth
Incisors
Canine
Premolars
Molars
Mains parts of the tooth
Crown
Neck
Root
Enamel/Cement
Dentine
Pulp Cavity/Root canal
What structures are found in the oral cavity?
Frenulum of tongue Palatoglossal arch Uvula Palatine tonsil Palatopharyngeal arch
Which two bones is the tongue attached to?
Mandible and hyoid
What are the extrinsic muscles of the tongue? What are their innervations?
Genioglossus - CN XII (hypoglossal)
Hyoglossus - CN XII
Styloglossus - CN XII
Palatoglossus - CN X (vagus)
What are the sensory nerves of the tongue?
Posterior 1/3: glossopharyngeal nerve (CN IX)
Anterior 2/3: chorea tympani of CN VII and CN V3
Vertebral level of hyoid
C3
Vertebral level of bifurcation of carotid
C4
Vertebral level of cricoid
C6
Vertebral level of jugular notch
T2
Vertebral level of sternal angle/angle of Louis
T4/T5
Borders of the anterior triangle
- midline of neck
- SCM
- inferior border of the mandible
Contents of the anterior triangle
Strap muscles
Extrinsic muscles of the tongue
Borders of the submandibular triable
- inferior border of the mandible
- posterior and anterior belly of digastric
Contents of submandibular triangle
Mylohyoid Stylohyoid Submandibular gland Facial artery/vein Submental artery
Borders of submental triangle
- left and right anterior bellies of the digastric
- hyoid
Contents of the submental triangle
Mylohyoid
Borders of the carotid triangle
- SCM
- superior belly of omohyoid
- posterior belly of digastric
Contents of the carotid triangle
Carotid sheath:
- internal jugular
- common carotid
- vagus nerve
Hypoglossal nerve
Borders of the posterior triangle
Trapezius
SCM
Clavicle
Contents of posterior triangle
- Spinal accessory nerve (CN XI)
- transverse cervical nerve
- phrenic nerve
- external jugular
- subclavian vein
- brachiocephalic vein
- scalene muscles
Nerve from roots C1-C3 (inferior and superior)
Ansa cervicalis
Innervation of trapezius
Spinal accessory nerve CN XI
Innervation of sternocleidomastoid
Spinal accessory nerve CN XI
What things come out of jugular foramen?
- internal jugular vein
- internal carotid artery
- vagus nerve
- glossopharyngeal nerve IX (anterior)
- spinal accessory nerve XI (posterior)
Nerve from C3-C5
Phrenic nerve
Innervation of anterior belly of digastric
CN V3
Innervation of mylohyoid
CN V3
Posterior belly of the digastric
CN VII
Innervation of the stylohyoid
CN VII
Innervation of thyrohyoid
C1 of spinal nerve
Innervation of the sternohyoid
Ansa cervicalis
Innervation of the superior belly of the omohyoid
Ansa cervicalis
Innervation of the anterior, middle and posterior scalene muscles
C4-C7
Innervation of geniohyoid
Hypoglossal CN XII
Membrane between thyroid and hyoid
Thyrohyoid membrane
Vertebral levels of thyroid
C5-T1
Parts of the thyroid
Right and left lobes
Isthmus
Pyramidal lobe (present in only 45-55% of the population)
Origin of the superior and inferior thyroid arteries
Superior - external carotid
Inferior - thyrocervical trunk off subclavian
Origin of the superior, middle, and inferior thyroid veins
Superior - internal jugular
Middle - internal jugular
Inferior - brachiocephalic trunk
Found in 10% of the population; can be damaged during tracheotomy (artery)
Thyroid IMA artery
Innervation of the superior, middle, and inferior constricted muscles
Recurrent laryngeal nerve
Sensory innervation of oropharynx
CN IX (glossopharyngeal)
Sensory innervation of the laryngopharynx
CN X
Cartilage that causes motion of vocal cords
Arytenoid cartilage
What cartilages are the vocal cords attached to?
Arytenoid and thyroid
Makes up vocal cord; covered in mucosa
Vocal ligament
Connect the cricoid to thyroid
Median and lateral cricothyroid ligament
Innervation of cricothyroid
External branch of the superior laryngeal nerve
Innervation of posterior cricoarytenoid
Recurrent laryngeal nerve
Innervation of lateral cricoarytenoid
Recurrent laryngeal nerve
Innervation of oblique and transverse arytenoids
Recurrent laryngeal nerve
Action of oblique and transverse arytenoids
Transverse movement of vocal cords
Innervation of vocalis
Recurrent laryngeal nerve
Action of cricothyroid
Stretches vocal cords
Action of posterior cricoarytenoid
ABduction of vocal cords
Action of lateral cricoaterynoids
ADDuction of vocal cords
Action of thyroarytenoid
Slackens vocal cords
Action of vocalis
Modulates thyroarytenoid and cricothyroid
Bloody supply and drainage of the larynx. Where does each artery/vein originate?
Superior laryngeal artery - superior thyroid artery
Inferior laryngeal artery - thyrocervical trunk
Superior laryngeal vein —> superior thyroid vein —> internal jugular
Inferior laryngeal vein —> inferior thyroid vein —> brachiocephalic
Branch of the common carotid that has many branches in the neck
External common carotid