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Lecture 14

ANAT 214 Lecture 14: ANAT214_Lecture_14

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McGill University
Anatomy & Cell Biology
ANAT 214
Louis Hermo

The gut has a very complicated arrangement, but there is organization Innervation Everything outside the CNS is the PNS In the gut there is sympathetic and parasympathetic innervation Sympathetic o Chain of two neurons attached together, with the first cell body in the CNS and the second cell body either at the para-vertebral ganglia or the pre-aortic ganglia The coeliac, superior and inferior mesenteric nerves will all have the second cell body pre-aortic o Splanchnic nerves go toward the ganglia in the gut (visceral structures) Preganglionic myelinated fibers Go through the diaphragm and runs with the coeliac, superior and inferior Sympathetic Parasympathetic o Vagus nerve The first cell body is in the CNS and the second is in the wall of the gut Behind the hilum, supplies the head, heart, vascular system and the lungs Whereas the phrenic nerve is in front of the hilum going to the diaphragm The part of the vagus that goes over the aorta branches into the recurrent laryngeal nerve Supplies the foregut and midgut o Cranio-sacral outflow: The hindgut get's its parasympathetic innervation from sacral nerves S1,2,3,4 which are the splanchnic nerves Foregut Oropharynx o Cranial nerves 5,7,9,10,12 will be covered o Sagittal section shows the tongue, bony palate, soft palate The blue area is the naso-pharynx above the soft palate The oro-pharynx is the mouth cavity The back of the tongue has the epiglottis blocking the trachea which is before the pharynx There is the opening to the Eustachian tube Has tubal tonsils that guard the opening to the middle ear This is underdeveloped in kids, which is why they have ear infections ofteno When you look into the mouth, you only see the anterior 2/3 of the tongue You can also see the palato-gloassal arch and the palato-pharyngeal arch which house the palatine tonsils and have muscles in them o Floor view shows anterior 2/3 of the tongue and the posterior third called the root of the tongue The anterior and posterior are separated by the terminal sulcus and the foramen cecum At the tip there is a little hole called the foramen cecum, which is the embryological site where the thyroid gland originated and then migrated down the neck and in front of the larynx
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