Head and Neck Flashcards
Between what two bones is the sagittal suture found?
The two parietal bones
Between what two bones is the coronal suture found?
The frontal and the parietal bones
Between what two bones is the lambdoid suture found?
The parietal and occipital bones
What are the three fossa on the floor of the skull known as?
The anterior cranial fossa, the middle cranial fossa and the posterior cranial fossa
What is the largest foramen in the skull known as and in which fossa is it found?
The foramen magnum, which is found in the posterior cranial fossa
What structures pass through the foramen magnum?
The medulla, with meninges, and the right and left spinal arteries
What are sinuses in the skull?
Air spaces present within some skull bones
Why are sinuses present within the skull?
To decrease the weight of the skull
What are the anterior, posterior and lateral borders of the scalp?
Anterior- eyebrows
Posterior- superior nuchal lines
Lateral- superior temporal line
Which two bones form the zygomatic arch?
The zygomatic bone and the temporal bone
What are the five layers of the scalp, from superior to inferior?
Skin Connective tissue (dense) Aponeurosis of the occipitofrontalis muscle Loose connective tissue Pericranium (Think SCALP)
What is the source of cutaneous innervation in the anterior part of the scalp?
The branches of the trigeminal nerve
What is the source of cutaneous innervation in the posterior part of the scalp?
Anterior and posterior rami of spinal nerves C2 + C3.
What are the branches of the external carotid artery in the skull?
Superior thyroid artery Ascending pharyngeal artery Laryngeal artery Facial artery Occipital artery Posterior auricular artery Maxillary artery Superficial temporal artery
What is diploe within the skull?
Space between compact bone
Describe the lymphatic drainage of the scalp
There are no lymph nodes in the scalp, lymph drains from the scalp into lymph nodes in the head and neck
What muscle surround the eyes?
The orbicularis occuli
What muscle surrounds the mouth?
Orbicularis oris
What muscle is present on the forehead and back of the head, with an aponeurosis between?
The occipital frontalis
What nerve innervates all the muscles of facial expression?
Cranial nerve VII (facial nerve)
What is the name of the foramen that the facial nerve emerges from to go onto the side of the face?
The stylomastoid foramen
What bony points are present on either side of the stylomastoid foramen?
The styloid process and the mastoid process
What are the names of the three main pairs of salivary glands?
The parotid, submandibular and sublingual glands
What are the borders of the parotid gland?
Anterior border of the sternocleidomastoid
Zygomatic arch
Angle of the mandible
Masseter muscle
Just anterior to the external auditory meatus
What type of gland is the parotid gland?
Exocrine
Opposite which tooth does the parotid duct open into the oral cavity?
The second upper molar
Which vein, artery and nerve passes into the parotid gland?
Vein- retromandibular
Artery- external carotid
Nerve- facial nerve (cranial nerve VII)
Where does the parasympathetic and sympathetic nervous supply for the parotid gland come from?
Parasympathetic- glossopharyngeal nerve
Sympathetic- superior cervical sympathetic ganglion
What are the three main branches of the trigeminal nerve?
Opthalmic
Maxillary
Mandibular
As the facial artery winds onto the face, what bone and gland does it touch?
The mandible and the submandibular salivary glands
What muscle lies immediately posterior to the facial artery as it winds onto the face?
The masseters
What are the four compartments of the neck when viewed in the transverse plane?
The vertebral compartment
The vascular compartments (one on each side)
The visceral compartment
The musculofacial collar
What are the superior, anterior and posterior boundaries of the anterior triangle of the neck?
Superior- Inferior border of mandible
Posterior- Anterior border of the sternocleidomastoid muscle
Anterior- Median line of neck
What are the inferior, posterior and anterior borders of the posterior triangle of the neck?
Inferior- Clavicle
Posterior- Anterior border of trapezius
Anterior- Posterior border of sternocleidomastoid
What are the attachments of the sternocleidomastoid?
The mastoid process, the superior nuchal line, the manubrium and the clavicle
What are the boundaries of the submental triangle of the neck?
The anterior digastric muscle, the midline of the neck and the body of the hyoid bone
What lymph nodes are found in the submental triangle?
The submental lymph nodes
What are the boundaries of the digastric/submandibular triangle?
Posterior digastric muscle, anterior digastric muscle and the mandible
What artery and what salivary gland is located in the digastric triangle?
The facial artery and the submandibular gland
What are the boundaries of the carotid triangle?
Superior belly of omohyoid muscle, posterior belly of digastric muscle and the medial border of SCM.
What are the boundaries of the muscular triangle of the neck?
The midline of the neck, the hyoid bone, the superior belly of omohyoid
and the inferior portion of SCM
What artery do the left and right common carotid arteries branch off?
Left CCA- aortic arch
Right CCA- brachiocephalic trunk
What structures occupy the carotid sheath?
The internal jugular vein, the vagus nerve and the common carotid artery
At what vertebral level does the CCA split into the ICA and ECA?
C4, at the superior border of the thyroid cartilage
What are the two terminal branches of the external carotid artery and where are they given off?
The maxillary and superficial temporal arteries, given of at the parotid gland
What vein from the upper limb does the internal jugular vein merge with, and what is formed?
IJV merges with the subclavian vein to form the brachiocephalic vein
Which vein does the external jugular vein drain into?
The subclavian
On which neck muscle does the phrenic nerve lie?
The anterior scalene muscle
What are the names of the suprahyoid muscles?
Mylohyoid
Geniohyoid
Digastric
Stylohyoid
What is the nerve supply of the mylohyoid?
Branch of inferior alveolar nevre from CNV3
What is the nerve supply of the geniohyoid?
Hypoglossal nerve
What is the nerve supply of the digastric?
Branch of posterior alveolar AND digastric branch of CNVII
What is the nerve supply of the stylohyoid?
Facial nerve
What are the names of the infrahyoid muscles?
Sternohyoid
Sternothyroid
Thyrohyoid
Omohyoid
What is the nerve supply of the sternohyoid?
C1-C3 by branch of ansa cervicalis
What is the nerve supply of the sternothyroid?
C2 + C3 by branch of ansa cervicalis
What is the nerve supply of the thyrohyoid?
C1
What is the nerve supply of the omohyoid?
C1-C3 by branch of ansa cervicalis
What are the vertebral root values of the cervical plexus?
C1-C4
Between which two muscles do the roots of the cervical plexus emerge?
The levator scapulae and the scalene
What name is given to the loop of nerves within the cervical plexus?
The ansa cervicalis
What are the two parts of the thyroid gland?
The pyramidal lobe and the isthmus
Between which tracheal rings does the isthmus of the thyroid gland lie?
Around the 2nd/3rd tracheal rings
In which of the four compartments of the neck does the thyroid gland lie?
The visceral compartment
What are the main functions of the nose?
Traps dirt
Respiration
Conditioning of inhaled air
Olfaction/smell
What are the three sections of the pharynx?
The nasopharynx, the oropharynx and the laryngopharynx
What vertebral levels are the extent of the trachea?
C6-T5/7
What bones make up the lateral wall of the nasal cavity?
Frontal bone Ethmoid bone Sphenoid bone Palatine bone Maxillary bone Inferior concha Nasal bone (FEMSPIN)
What bones make up the roof of the nasal cavity?
The nasal bones, the frontal bone, the ethmoid bone and the sphenoid bone
What is the floor of the nasal cavity made up of?
The palatine processes of the maxillae and the palatine bones making up the hard palate. Floor extended posteriorly by soft palate
What bones make up the nasal septum?
The vomer and the perpendicular plate of the ethmoid
What structure lies anterior to the vomer and the ethmoid to complete the nasal septum?
Septal cartilage
What passes through the cribriform plate?
The olfactory nerves
What attaches to the crista galli?
Dura matter
What kind of epithelium lines the nasal cavity?
Pseduo-stratified squamous epithelium with goblet cells
What lines the roof of the nasal cavity?
Olfactory mucosa
Which cranial nerve innervates the olfactory mucosa?
The olfactory nerve (CNI)
What are the projections of the lateral wall of the nasal cavity called?
The superior, middle and inferior conchae
What are the spaces between the conchae called?
The superior, middle and inferior meatuses
What space lies above the superior concha?
The frontal sinus
What bones are each concha a part of?
The superior and middle conchae are projections of the ethmoid bone. The inferior concha is it’s own bone
Branches of which arteries supply the nose?
The ophthalmic and the external carotid arteries
What are the main functions of the paranasal air sinuses?
They lighten the skull and produce mucus
What does the sphenoid sinus open into?
The spheno-ethmoid recess
What do the posterior ethmoid air cells open into?
The superior meatus
What structures open into the middle meatus?
The maxillary and frontal sinuses
The anterior and middle ethmoidal air cells
What does the nasolacrimal duct open into?
The inferior meatus
Why does the maxillary air sinus drain less well than the other sinuses?
Its opening is not at its most inferior point
What cranial nerve innervates the frontal air sinus?
CNV1
What cranial nerve innervates the maxillary air sinus?
CNV2
What cranial nerve innervates the sphenoid air sinus?
CNV1 and CNV2
What cranial nerve innervates the ethmoidal air cells?
CNV1
What are the three pairs of tonsils and where is each found?
Lingual- on the tongue
Palatine- at back of throat
Nasopharyngeal- in nasopharynx
Which bone forms the roof of the nasopharynx?
The sphenoid
What number of each type of deciduous tooth is there?
Incisors- 8
Canines- 4
Molars- 8
What number of each type of permanent tooth is there?
Incisors- 8
Canines- 4
Premolars- 8
Molars- 12
What type of joint is the temperomandibular joint?
Synovial hinge
Which two articular processes form the temperomandibular joint?
The mandibular fossa of the temporal bone and the condyloid process of the mandible
What movements of the jaw occur at the temperomandibular joint?
Elevation Depression Protrusion Retrusion Side to side movements
What are the muscles of mastication?
The temporalis, masseter and the lateral and medial pterygoids
What are the bony attachments of the temporalis muscle?
The floor of the temporal fossa and the coronoid process of the mandible
What action does it have on the mandible when:
The anterior fibres of the temporalis muscle contract?
The posterior fibres of the temporalis muscle contract?
Anterior fibres- elevates mandible
Posterior fibres- retract mandible
What are the bony attachments of the masseter muscle?
The angle + lateral surface of the mandible and the outer surface of the ramus + maxillary process of the mandible
What is the action of the masseter?
Elevate the mandible
What parts of the skull do the pterygoid muscles attach to?
The lateral pterygoid plate (lateral pterygoid attaches to lateral surface, medial pterygoid attaches to medial surface)
Neck of mandible and disc of temperomandibular joint
What action does bilateral contraction of the lateral pterygoid muscles cause?
Protraction
What action does bilateral contraction of the medial pterygoid muscles cause?
Elevates jaw and causes protrusion
What action occurs when the lateral pterygoid and the medial pterygoid of the same side both contract?
Swings jaw
Which suprahyoid muscles depress the mandible?
The digastric, myelohyoid and stylohyoid muscles
What muscles elevate the mandible?
Temporalis, masseter and medial pterygoid
What muscles protrude the mandible?
Medial pterygoid and masseter
What muscles retract the mandible?
Temporalis
What muscles move the mandible side to side?
Lateral pterygoids
Through what fossa do the motor branches of the trigeminal nerve supply the muscles of mastication?
The infratemporal fossa
What is the space between the lips and the cheeks known as?
The vestibule of the oral cavity
Which two bones form the hard palate?
The palatine process of the maxilla and the horizontal plates of the palantine bone
What are the muscles in the soft palate?
Tensor veli palatini Levator veli palatini Palatoglossal Palatopharyngeal Muscularis uvulae
What cranial nerves supply the soft palate?
CNV3 and CNX
What is the action of the soft palate?
To aid in swallowing/yawning
What are the boundaries of the oropharynx?
Anteriorly- right and left palatoglossal arches
Superior- uvula
Inferior- tip of epiglottis
What are the main functions of the tongue?
Moving food around during chewing
Deglutition
Articulation
What divides the anterior 2/3 and posterior 1/3 of the tongue?
The sulcus terminalis
What are the three types of papillae and what part of the tongue are they most present on?
Filiform
Fungiform
Vallate
All most common on anterior 2/3 of tongue
Which of the papillae of the tongue have taste buds present in them?
Fungiform and vallate papillae
What are the projections on the posterior third of the tongue called and what are they produced by?
Lymphoid nodules- produced by submucosal lymphoid tissue collection
What is the inferior surface of the tongue covered by?
Smooth mucous membrane
What is the name of the fold of mucous membrane that fixes the tongue to the floor of the mouth?
The sublingual corunde
Describe the general sensory and taste sensation innervation of the anterior 2/3 of the tongue
General sensory- Lingual nerve (CNV3)
Taste- Chorda tympani branch of facial nerve (CNVII)
Describe the general sensory and taste sensation innervation of the posterior 1/3 of the tongue
General sensory- Glossopharyngeal nerve (IX)
Taste- Internal laryngeal
What are the four extrinsic muscles of the tongue?
The genioglossus, the hypoglossus, the styloglossus and the palatoglossus
What are the attachments and action of the genioglossus?
Attachment- inner surface of the mandible close to midline
Action- Protudes tongue to opposite side
What are the attachments and action of the hypoglossus?
Attachment- Upper border of body of mandible
Action- depresses tongue
What are the attachments and action of the styloglossus?
Attachment- styloid process
Action- Retrudes tongue
What are the attachments and action of the palatoglossus?
Attachment- soft palate
Action- Elevates posterior tongue
Describe the innervation of the muscles of the tongue?
Palatoglossus- Vagus nerve (CNX)
All other muscles- hypoglossal (CNXII)
What are the names of the three large paired salivary glands?
Parotid
Submandibular
Sublingual
Which cranial nerves supply parasympathetic innervation to the salivary glands?
Parotid gland supplied by glossopharyngeal nerve (CNIX)
Submandibular and sublingual glands supplied by facial nerve (CNVII)
With what vertebral levels do the larynx extend?
C3-C6
With which structure is the larynx continuous with superiorly?
The hypopharynx
What does the larynx continue as inferiorly?
The trachea
Prominences of which laryngeal cartilage form the Adam’s apple?
The thyroid cartilage
Which of the laryngeal cartilage are paired?
The arytenoid, corniculate and cuneiform cartilages
Which of the laryngeal cartilages is a complete ring shaped cartilage?
The cricoid cartilage
What structures form the laryngeal inlet?
Epiglottis
Corniculate cartilage
Arytenoid cartilage
Interarytenoid and aryepiglottic folds
What are the three parts of the larynx called and between what structures is each found?
The vestibule- between the laryngeal inlet and the vestibular folds
The middle part- between the vestibular folds and the true vocal cords
The lower part- from the vocal cords to the lower border of the cricoid cartilage
What sensory nerve supplies the mucous membrane of the larynx
Internal laryngeal nerve
What forms the roof of the nasopharynx?
The bassiocciput and the bassiopenoid
Where does the laryngopharynx lie in relation to the larynx?
Inferiorly
What three muscles form the inner longitudinal layer of the pharynx?
Stylopharyngeus
Salpingopharyngeus
Palatopharyngeus
What are the three layers of the pharynx?
The outer muscular layer
The middle fibrous layer
Inner mucous membrane
Where does the pharynx receive it’s innervation from?
The pharyngeal plexus
Branches of what cranial nerves forms the pharyngeal plexus?
Nine and ten
Which nerve supplies sensory innervation to the pharynx?
The maxillary
Which nerve provides most of the motor innervation to the pharynx?
The pharyngeal nerve
What role is played by constrictor muscles of the pharynx during swallowing?
Propels food into the oesophagus
What is the role played by the longitudinal layer of muscles of the pharynx during swallowing?
Elevate the larynx and shortens the pharynx
What is the role played by the tongue and palate muscles during swallowing?
Soft palate moves to block trachea
What is the pharyngeal lynphoid ring and what is its function?
A collection of lymphoid tissue- protects from RTIs