Cervical And Cranial Nerves - Stephens - 3/22 Flashcards
Which nerves are innervated by C2-C3?
Lesser occipital
Great auricular
Transverse cervical
Lez Gay Transgender
Which nerves are innervated by C3-C4?
Supraclavicular n
What is the superior root of the Ansa cervicalis innervated by?
Inferior root?
C1-C2
C2-3
Where does the superior root leave?
The hypoglossal nerve below the posterior di gastric
What innervates the thyrohyoid muscle?
Nerve to thyrohyoid, branch of CN 12
What is located immediately posterior to the anterior scalene muscle?
Brachial plexus
Erb-Duchenne affects what portion of the brachial plexus?
Klumpke’s?
Upper
Lower
What do GSA fibers convey?
What embryological origin?
What type of sensation?
Paint, temp, tactile pressure, proprioception
Ectodermal
Sharp, highly localized pain
What do GVA fibers convey?
Embryological origin?
What type of sensation?
Visceral pain (stretch, ischemia) and reflexes
Endodermal
Dull, aching, throbbing
What muscles in the head are of myotoxic origin?
What fibers innervate them?
Tongue and extra-ocular mm
GSE
What are GVE fibers associated with?
ANS
Where does GSA info in the face go to?
Trigeminal sensory complex
What are the 3 nuclei of the Trigeminal sensory complex and where do they receive info from?
Mesencephalic nucleus (proprioception from facial m.) Main sensory nucleus (precise tactile info from face) Descending nucleus (crude tactile, pain, temp from face)
What is the NTS the sensory nucleus for (GVA fibers)?
From the posterior 1/3 of the tongue to mid-portion of the transverse colon
What does the NTS receive SVA info from?
Ant. 2/3 of tongue via CN 7
Post. 1/3 of tongue via CN 9
Epiglottis via CN 10
The NTS is the sensory nucleus for what kind of reflexes?
Where?
Visceral reflexes in head and neck (salivary, lacrimation, carotid, gag, cough)
Organs in thorax and abdomen
The SVE fibers innervate muscles derived from where?
Mesenchyme of the branchial arches
Branchial arch 1 is associated with what kind of muscles?
What CN?
Muscles of mastication
CN 5
Branchial arch 2 is associated with what kind of muscles?
What CN?
Mimetic (m. Of facial expression) muscles
CN 7
Branchial arch 4 is associated with what kind of muscles?
What CN?
Pharyngeal and laryngeal muscles
Nucleus Ambiguus (CN 9,10,11)
What is Collet’s/Sicard’s/Villaret’s syndrome due to?
Involve what?
Injury to retroparotid space
Ipsilateral paralysis to CN 9-12 and cervical sympathetic trunk
Lesions in CN 9 result in what?
Loss of gag reflux
Slight dysphagia
Loss of sensation in pharynx and post. 1/3 tongue
Lesions in CN 10 result in what?
Dysphonia
Dysphagia
Dyspnea
Loss of gag or laryngeal cough reflex
Lesion in CN 11 results in what?
Inability to shrug shoulder, flex and rotate head
Lesion in CN 12 results in what?
Deviation of protruded tongue towards the affected side
What is Vernet’s syndrome?
Basilar skull fracture due to trauma may involve the jugular foramen
-> ipsilateral CN 9,10,11 paralysis
The superficial branches of the cervical plexus are formed by what nerves?
C2-C4
