biology 323 human anatomy for biology majors lecture 18 dr. stuart s. sumida
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Biology 323 Human Anatomy for Biology Majors Lecture 18 Dr. Stuart S. Sumida. From the Head to the Neck (or was it from the body to the neck?). Carotid Sheath: Carotid Artery Jugular Vein Vagus Nerve Do you remember what foramina these pass through?!. Superior Pharyngeal - PowerPoint PPT PresentationTRANSCRIPT
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Biology 323Human Anatomy for Biology MajorsLecture 18Dr. Stuart S. Sumida
From the Head to the Neck(or was it from the body to
the neck?)
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Carotid Sheath:• Carotid
Artery• Jugular Vein• Vagus Nerve
Do you remember what foramina these pass through?!
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Superior PharyngealConstrictor (attaches toPterygomandibular raphe’)
Middle PharyngealConstrictor (attaches toHyoid bone) Inferior PharyngealConstrictor (attaches toThyroid and cricoid cartilages)
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Phonation(Speaking)
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Phonation & Articulation1.Glottis closes
– Recurrent laryngeal nerve from CN X2.Air is forced through the glottis
– Vocal folds vibrate and produce a constant tone (phonation)
3.Pitch of the tone depends on:– Diameter, length, tension of vocal folds
(CN X)
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Glottisclosed
Vocal folds
Epiglottis
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Geniohyoid(elevates hyoid or depresses jaw)
Sternum
Thyrohyoid(depresses hyoid or raises larynx)
Sternothyroid(depresses larynx)
Sternohyoid(depresses hyoid)
“Strap” MusclesAid in Phonation
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Pathways of the Vagus Nerve (CN X)X
SensoryBranchial Motor
ParasympatheticJugularforamen
Hyoid bone
Thyroid cartilage(Laryngeal cartilage)
Cricoidcartilage
Recurrentlaryngealnerve
Eso
phag
usP
hary
ngea
lC
onst
ricto
rM
uscl
es LaryngealMuscles
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Phonation & Articulation4.The tone is articulated into voice.
– Tone depends on:• Size and shape of the oropharynx and
nasopharynx• Position of jaw (CN V3), tongue (CN XII), and
lips (CN VII)
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Test yourself and identify the following structures…
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Anterior Posterior
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Anterior Posterior
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Posterior
Anterior