H&N 4 Flashcards
What is the first cranial nerve, and what does it supply?
olfactory nerve: contains only special sensation fibres and is distributed to uppermost part of nasal cavity, and is concerned with smell
why might a loss of smell be associated with a fracture of the ethmoid bone?
the olfactory nerve concerned with smell reaches the nose via the cribiform plate of the ethmoid bone.
Fractures of ethmoid involving dura mater may be assoc. with CSF leakage from nose
general sensory fibres of facial nerve supply what?
part of external acoustic meatus and auricle
how is innervation provided to the carotid sinus and carotid body?
via the the sinus nerve branch of the glossopharyngeal nerve
general sensory distribution of glossopharyngeal nerve?
pharynx, oropharyngeal isthmus, dorsum of palate, auditory tube + assoc structures, mastoid antrum, mastoid cells
which nerves are sensory to the external acoustic meatus and auricle?
facial and vagus nerves
vagus- back of auricle
which palate muscle is not supplied by the vagus nerve?
tensor veli palatine
which cranial nerve has both a cranial and spinal part?
accessory nerve (XI) cranial root accessory to vagus
fibres from which roots are contained by the spinal root of the accessory nerve?
C2,C3,C4
motor supply of hypoglossal nerve?
all muscles of tongue, except palatoglossus
other name given to infrahyoid muscles?
strap muscles of neck
what is formed by some cervical nerves frrom C1, C2 and C3 being looped onto the hypoglossal nerve?
ansa cervicalis
these fibres are distributed to strap muscles of neck
where do the cervical sympathetic trunks lie?
pass vertically up to base of skull, lying on prevertebral fascia and muscles, and lying deep to carotid sheath
where do the postganglionic fibres from the superior cervical ganglion pass?
with the external and internal carotid artery and its branches, to the pharyngeal plexus, to the upper 4 cervical nerves and in a cardiac branch to the cardiac plexus
with which artery do the post-ganglionic fibres of the middle cervical ganglion pass?
inferior thyroid
where do the post-ganglionic fibres of the middle cervical ganglion run to?
the 5th and 6th cervical nerves and in a cardiac branch to the cardiac plexus
how is the stellate ganglion formed?
combination of inferior cervical ganglion and 1st thoracic ganglion
with which artery do post ganglionic fibres from inferior cervical ganglion pass?
vertebral artery
what are the 4 pairs of parasympathetic ganglia in the head?
ciliary- oculomotor nerve
pterygopalatine- facial nerve
submandibular- facial nerve
otic- glossopharyngeal nerve
where is the ciliary ganglion?
lies in orbital cavity, lateral to optic nerve
PNS fibres pass to ciliary muscles and sphincter papillae
where is the pterygopalatine ganglion?
lies in pterygopalatine fossa
connected to maxillary nerve by small branches
receptive field territory of olfactory nerve?
nasal cavity, L and R supplied by separate L and R nerves
how does olfactory nerve form olfactory bulb?
nerve process leaves nasal cavity to ascend intra-cranially via foramina of cribiform plate of ethmoid, where they form olfactory bulb in the anterior cranial fossa
how may fracture of cribiform plate be experienced by a patient if olfactory nerve involvement?
anosmia, CSF rhinorrhea- drainage of CSF into the nose