Human Anatomy and Physiology I Laboratoryclassvideos.net/anatomy/pdf/senses.pdfHuman Anatomy and Physiology I ... Anatomy of the Eye Sclera Cornea Anterior segment (contains aqueous

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Human Anatomy and

Physiology ILaboratory

The Senses

This lab involves several exercises related to the senses: “Special Senses: Vision”, “Special Senses: Hearing and Equilibrium”, and “Special Senses: Olfaction and Taste”. .Complete the Review Sheets for the exercises and take the related quiz on the senses. There is also a video of the dissection of a sheep eye.Click on the sound icon for the audio file (mp3 format) for each slide. There is also a link to a dowloadable mp4 video which can be played on an iPod.

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The Variety of Senses

Mechanoreceptors – proprioceptors, touch, pressure, hearing, balance, pressure, vibration, movement

Chemoreceptors – taste, smell, visceral senses (O2, CO2, pH, etc.)

Thermoreceptors – hot and cold

Nociceptors – pain

Photoreceptors – vision

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The Special Senses

Based on the complexity of the receptors:

Taste

Smell

Vision

Hearing and balance

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Taste

Taste bud

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Circumvallate papillae

Taste cells

microvilli

Basal cells

Taste buds – groups of taste cells located on papillae of tongue as well as hard palate and epiglottis.

• circumvallate papillae – large, round, back of tongue.•filiform papillae – no taste buds, near tip, touch receptors.

•fungiform papillae – most abundant, over most of tongue.

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Fungiform Papillae on the Tongue

Taste budsStratified squamous epithelium

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Lateral View of the EyeLevator

palpebrae sup.

Sup. Rectus

Lat. Rectus

Inf. Rectus

Orbicularis oculi

Ocular conjunctiva Conjuctival sac Palpebral conjunctiva

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Anterior View of Eye

Lacrimal gland

Lacrimal canal

Lacrimal sac

Nasolacrimal duct

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Extrinsic Muscles of the Eye

Sup. Oblique m.

Sup. Oblique tendon

Trochlea

Lat. Rectus m.

Med. Rectus m.

Inf. Oblique m.

Inf. Rectus m.Lat. Rectus m.

Sup. Rectus m.

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Anatomy of the Eye

Sclera

Cornea

Anterior segment (contains aqueous

humor)Canal of Schlemm

Vitreous body

Choroid coatRetina

Ciliary body

Suspensory lig.

Iris

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SagittalSection

cornea

iris

anterior chamber

lens

posterior chamber

ciliary body

oraserrata

retina

choroid

sclera

optic diskSuspensoryligament

Posterior segment (vitreous body)

Anterior segment

muscle insertion

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Dissection of the Eye: The Optic Nerve

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Sheep Eye Cornea

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Sheep Eye Vitreous Humor

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Sheep Eye: Vitreous Humor and Lens

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Sheep Eye: Choroid Coat and Retina

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Sheep Eye: Ciliary Disk and Iris

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The Tapetum Lucidum

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The Ear

Auricle

External auditory canal

External ear

Middle ear Inner ear

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Middle and Inner EarOssicles: stapes incusmalleous

Int. jugular v. Eustachian canal

Round window

Semicircular canals

Cochlea

Vestibule

Vestibular n. cochlear n.

of VIII

Tympanic membrane

Oval window

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Lab Protocol for The Senses

1) Complete the Review Sheets for the exercises on the Special Senses

2) Take the related quiz for the Senses.

3) View the cadaver video showing dissection of the sheep eye.