Sensory Mechanism Marie Černá.

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Presentation transcript:

Sensory Mechanism Marie Černá

Five categories Mechanoreceptors - muscle spindle - hair cell in ear Pain receptors (nociceptors) Thermoreceptors Chemoreceptors - gustatory (taste) - olfactory (smell) Electromagnetic receptors - photoreceptors

Structure of the eye

Retina Photoreceptors Neurons

Cells of Retina

The effect of light on retinal

Focusing in the eye

Structure of the ear

Structure of the ear

A cross-sectional view of the cochlea with three canals

Mechanoreceptors

Mechanism of hearing Vibrations, caused by sound waves, in the tympanic membrane are conducted via 3 small bones to the oval window and create pressure waves in the cochlear fluid - perilymph. The waves pass through the vestibular canal to the apex of the cochlea, then back toward the base of the cochlea via the tympanic canal and end on the round window. Semicircular canals Cochlea

As the basilar membrane vibrates, hair cells repeatedly brush against the tectorial membrane. This stimulus causes hair cells to depolarize. Perilymph

Organs of balance

A vestibule contains two chambers: the utricle and saccule

Gustatory chemoreceptors

Olfactory chemoreceptors

Nociceptors + Thermoreceptors

Literature Biology, eighth edition, Campbell, Reece Unit seven: Animal Form and Function Chapter 50: Sensory and Motor Mechanisms Concept 50.1, 50.2, 50.3, 50.4 Pages 1087 – 1105

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