Sensory Nuclei in Medulla and Pons

Sensory Nuclei in Medula and Pons 3 types: Solitarius (unique; only one) 8) •Superior: Gostotory nucleus 8 (CN VII, X,X) ESVA} -CN mnenates the anterior 2/3 of the tong's taste sensory sensations -CNE innervates the posterior V3. of the tong's taste and general ser and sensory sensations & pharynx -Taste for Glossopharongeal n. is Chala reflex: Stimulating the Pharynx (base Stimulating the Glossopharangeal nerve) and the response will by by the Vagas nerve which is vomitting Vagus n. (CNX): innervoles sense of The Larynx & test sensations epiglottis and patate & the ②Vestibulocochlear nuclei (CNJIII) • vestibular part: Superior (in Pons.) (for Inferior (in Medulla) Medial (in Hedulla) Lateral (deiter Medulla) • Cochlear part: Lateral towards doreal (location) Sensory part of Trigeminal n. (CND). {GSA}) (bongest nucleus) All sensations from the nose, eyebrows, morbil, sinuses, ant part of the head head, and meninges are supplied by the sensory part & the Frigeminal nerve. Moves albing 3 parts: @in Hidbrain: Mesencephalic part In Pontine: Pontine part Sopinal part: Hoves dong pors, Meshula and down to SC Differences between this nucleus and other nuclei In the SC, every segment is innervaded by one Spinal Cherve (Pale, light& fintouch, temp., etc.), but in Trigemml sensory nucleus, is devided in the Medula to: • Upper part dedicated for fine touch and proprioception • Upper part of the spinal part: dedicated for prin in the teeth • Middle part of the Spinal part: dedicated for ligtht houch • Lower part of the spinal part: dedicated for pain & Temperatura 26 Trigeminal Nucleus is Bilateral). ③ The first order neuron. is in Irigeminal are mostrly located in the Brainstem and not located. in the ganglion (The origin of a ganglion developmentally is from Neural crest, and CNS originates from the neural tube which means first order neuron of the face (sense for discriminative touch and proprioception) originates from Neural tube not neural crest) •So, Our cortex is the ore responsible for controlling the face (facial exprny) and this is what makes the face differ sensations different from other parts of the body's sensations Autonomic nuclei in Medulla and pons (GIVE •Autonomic nuclei in the brain stem are Parasympathetic.. •Parasympathetic trucks are called Craniosacrals) •Sympathetic trunks are called (Thoracolumbar - There are four Parasympathetic nuclei in Brain Stemå Dorsal vigal nucleus: dedicated to the Vagus Inferior Salivatory nucleus: dedicated to the Glossopharyngeal (buervates Purollid ghind ③ Superior Salivatory nucleus Nasolacrimal nucleus. 3 Dedicated to Facial nerve Innenbeplacid gland, Submandibulas and sublingual ghonds Ednger-Westphal nudeus; decicated to oclumotor nerve's Parasympathetic part & the eyeball • Innervates parasympathetic part of the eye ball's Pupil muscles and muscles of citiary baly fudor (which is ing. for accomodation) •Lesion in this pathway causes Expansion in pupil size and @Lateral Strabismus @Phosis (droping of the upper eyelid) Hiosis in Sympathetic, which means exccassive constriction of the R Pupil, also called Mydriasis) White matter in the brain stem, like in the SC, is devided into three groups: Acending Decending communicating (commu Acending 21-Medial leminiscus : from upper totes laive discriminative touch, concious proprioception 2-Lateral Leminiscus for audiotary Puthury (in cachon nucleus inhinkeng 3- Trigeminal leminisons: Origin fron brainstemg dedicated to afteros from The face (proprioception, Jenevalsensation, etc...) 4- Spindhalamic track: ledistal lon b pain, and temperature! Nole -Spinothalamic + Spinobectal = spinal leminiscus. So, alternative name of spinothalamic tract in brainstem is called Spinal Leminiscus 5-Spirotectal pathway = are small fibers from SC to colli most usually found in dd anim mot human of more developeil ex. in frogs, the upper part of brain is the brainstem, and Toctu is the & cephalic part of brains So recieving information from the body NILAL *Decending Bathways 1- Corticospiml tract: cmgrate her be revbehang Braim Brainstem 2-Vestibulaspinal trad: originates in Vestibular nucleus i respon for fascilitation of extensor muscles 3- Reticuluspinal tract: anginates fr tone bramen & it is neccess the alive and Concho Con be 4-Rubrospinal Tract: originates from mid brain 5-Tectospinal Tract: aniginates from Midbrain dowr 6-Olivospinal Tract: originateken complet od Brainstow 7. Corticopontine: page corhot (corticopontorerebellar) palhuny from the cortex to the fons wherg begrepses in the Pentine nucleuss, the travels to the cerebellum Ribers 8- Commissural (communicating) pang: connect muxtel branace Hesycther; imponent for some Pelleme eg deereases HR when was micious intervales extolly you and vegal nucleus (col Vegal nucleus parampa -NILAI- drove Bfy. There is an iwwercas or fiber which connects Trigeminal nucleus to dorsal Vogal nucleas. OR when you accidently touch your eye, the refles will close it. The Sersillon & we eye dis from Trigemina nucleus, and eyelid muscles the Inservided by facial nucleus on there is an interneuron Connecting Trigeminal. Sensory nucleus to Factal motor nucleus OR GAG relieX (Between CN DEX •MLF: Medial longitudinal Fasciculus: is an example on braces in commisural nuclei •Trigeminal nucleus originutes in Pons Medial Medullary syndromes -Symptoms paralysis of the pauscles in the other Site & Hody (controlaterali (Pyramidal trast) - atrophy of the tongue Ipsilateraly Reasons Anterior Interior cerebellar Artery (AICA) ocludes (closes) ateral Medullary Syndrome): oclusion in Plasterior Inferior Cerebellar Artery (PICA) supplying the (dorstateral Sort of the Medula Results 18 noway & specch problems Dysphagia Adysar thria de of the Ipsilateral palsy! nucleus Ambi and laryngeal due toparalysis Analgesia and Thermoanesthesia on the Ipsilateral side of The bea free(nucleus and spinal tract of Trigeminal nerve) Verigo nausen, Vomiting and mysting mas nystagmus (vestibular nuclei Responsible for equilibrium ② controlateral loss of pain and temperature (spinal leminiscus- spinothalamic tract) 5 loss of unconcious proprioception (Ipsilateral cerebellar sigils: gait and limb alaxia In the Pons In a cresection, one can see 8 - Trigeminal motor nucleus -Abducent nucleus -Superior vestibular nucleus -Pantine nucleus -Corticospinal tract (called pyramidal tract in Medulla) -Corticopontine tract - Medial & Lateral Leminisci -Ventral Spinocerebellar in the Superior cerebellar peduncle in the Midbrain (dorsal Spirocarebeller goes through Medula) Lesions in the superior part of the Pons (a big lesionicaused by strong accidents) causes (locked-in- Syndrome affecting all the pothusi coming acending or derer ding (Spinatnedamia, turlices & wal, corticob and the only motor ability that is not affected is eye movement, because its innervation is from Trochler and ache costeel or Ainult in the Millbrain.