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THE SENSES
   chapter 19
RECEPTORS

• -- Structures that detect stimuli. They
  monitor both external and internal
  environmental conditions. Cond...
TYPES OF RECEPTORS
•   Chemoreceptors- they detect   •   Mechanoreptors- respond to
    chemicals.                        ...
THE TONGUE
• Gustation is our sense of taste. It
  permits us to perceive the
  characteristics of what we eat and
  drink.

• Gustat...
• Detects five basic taste sensations: salty,
  sweet, sour, bitter, & umami

• Facial Nerve - taste anterior 2/3 tongue

•...
THE EYE
CONJUNCTIVA

• Stratified squamous epithelium
• Forms a continuous lining of the
  external, anterior surface of the eye
• ...
FIBROUS TUNIC
• External layer of   • Mostly formed by
  the eye wall.         touch sclera

• Composed of
  anterior corn...
VASCULAR TUNIC

• Middle layer of the eye wall.
• also called “uvea” (grape)
• composed of three regions: choroid,
  cilia...
NERVES ASSOCIATED WITH THE   EYE

  • OPTIC
  • OCULOMOTOR
  • TROCHLEAR
  • ABDUCENS
THE EAR
THE [[external]] EAR
• A Skin covered cartilaginous structure
  called the auricle or pinna.
• The Auricle is funnel shape...
MIDDLE EAR
THE [[middle]] EAR

• Contains an air filled tympanic cavity.
• Includes the the bones from lateral to
  medial: Malleus, I...
INNER EAR
THE [[inner]] EAR

• Located within the petrous part of the
  temporal bone.
• It includes the: vestibule, the semi
  circ...
Nerves Associated With Inner Ear




• VESTIBULOCOCHLEAR NERVE
      & THE VAGUS NERVE
the process of hearing
•   1) sound waves are collected and funneled by the auricle of the
    external ear.


•   2) the vibrations of the tympa...
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Senses anatomy project

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Senses anatomy project

  1. 1. THE SENSES chapter 19
  2. 2. RECEPTORS • -- Structures that detect stimuli. They monitor both external and internal environmental conditions. Conduct information about those stimuli to the central nervous system.
  3. 3. TYPES OF RECEPTORS • Chemoreceptors- they detect • Mechanoreptors- respond to chemicals. touch, pressure, vibration, & stretch. • Thermoreceptors- respond to changes in temperature. • Baroreceptors- detect changes in pressure within body • Photoreceptors- detect structures. changes in light intensity, color, & movement. • Nocieptors- respond to pain caused by either external or internal stimuli.
  4. 4. THE TONGUE
  5. 5. • Gustation is our sense of taste. It permits us to perceive the characteristics of what we eat and drink. • Gustatory cells are taste receptors housed in specialized sensory organs termed taste buds on the tongue surface.
  6. 6. • Detects five basic taste sensations: salty, sweet, sour, bitter, & umami • Facial Nerve - taste anterior 2/3 tongue • Glossopharyngeal Nerve - taste posterior 1/3 tongue
  7. 7. THE EYE
  8. 8. CONJUNCTIVA • Stratified squamous epithelium • Forms a continuous lining of the external, anterior surface of the eye • Contains numerous goblet cells which lubricates and moistens the eye
  9. 9. FIBROUS TUNIC • External layer of • Mostly formed by the eye wall. touch sclera • Composed of anterior cornea & posterior sclera. • contains no blood vessels
  10. 10. VASCULAR TUNIC • Middle layer of the eye wall. • also called “uvea” (grape) • composed of three regions: choroid, ciliary body, & iris
  11. 11. NERVES ASSOCIATED WITH THE EYE • OPTIC • OCULOMOTOR • TROCHLEAR • ABDUCENS
  12. 12. THE EAR
  13. 13. THE [[external]] EAR • A Skin covered cartilaginous structure called the auricle or pinna. • The Auricle is funnel shaped and serves to protect entry into the ear. • Directs sounds waves into the bony tube called the external acoustic meatus.
  14. 14. MIDDLE EAR
  15. 15. THE [[middle]] EAR • Contains an air filled tympanic cavity. • Includes the the bones from lateral to medial: Malleus, Incus, & Stapes. • Responsible for amplifying sound waves and transmitting them into the inner ear.
  16. 16. INNER EAR
  17. 17. THE [[inner]] EAR • Located within the petrous part of the temporal bone. • It includes the: vestibule, the semi circular canals, & the cochlea. • Mechanisms for equilibrium are located within the inner ear.
  18. 18. Nerves Associated With Inner Ear • VESTIBULOCOCHLEAR NERVE & THE VAGUS NERVE
  19. 19. the process of hearing
  20. 20. • 1) sound waves are collected and funneled by the auricle of the external ear. • 2) the vibrations of the tympanic membrane causes movement by the auditory ossicles. • 3) pressure waves originate within the inner ear and travel through the perilymph in the scala vestibuli. • 4) high-frequency and upper medium frequency pressure waves in the scala vestibuli cause the vestibular membrane to vibrate, resulting in pressure wave formation in the endolymph of the cochlear duct. • 5) the remaining pressure wave vibrations in the cochlear duct are transmitted to the perilymph of the scala tympani and they exit the inner ear at the round window.

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