Chapter_17_SpecialSenses.ppt - Anatomy and Physiology I BIOL 2401 Chapter 17 Special Senses Chapter 17 Special Senses Learning objectives • List the

Chapter_17_SpecialSenses.ppt - Anatomy and Physiology I...

This preview shows page 1 - 11 out of 41 pages.

BIOL 2401 Anatomy and Physiology I Chapter 17 Special Senses
Image of page 1

Subscribe to view the full document.

Chapter 17 Special Senses Learning objectives: List the special senses and their location. Describe the structure and physiology of olfactory sense. Describe the structure and physiology of gustatory sense. Describe the structure and physiology of vision sense. Describe the structure and physiology of hearing and equilibrium sense.
Image of page 2
Special Senses Special senses Smell – Olfactory sense Taste – Gustatory sense Vision sense Hearing (auditory sense) and equilibrium Housed in complex sensory organs
Image of page 3

Subscribe to view the full document.

Olfactory Sense Located in the superior lining of the nasal cavity. The receptors are part of the nasal epithelium. Threshold of the olfactory receptor is low - only a few molecules of a chemical can stimulate the receptor. Olfactory receptors are rapidly adapting (phasic receptors).
Image of page 4
Olfactory epithelium is composed of: Olfactory receptors bipolar neurons with olfactory hairs embedded in mucus secretion. Supporting cells columnar epithelial cells. Basal cells (stem cells) replace receptors and supporting cells. Olfactory (Bowman’s) glands produce mucus to line the nasal cavity. Chemicals enter the nasal cavity stimulate olfactory cilia Olfactory receptors generate impulses nerve impulses travel through the cribriform plate of the ethmoid bone to the olfactory bulbs to the olfactory tracts finally to the cerebral cortex and limbic system. Olfactory Sense
Image of page 5

Subscribe to view the full document.

Gustatory Sense Located on the tongue, soft palate & pharynx. The receptors are on the lateral walls of the papillae. Threshold of the gustatory receptor is low - only a few molecules of a chemical can stimulate the receptor. Gustatory receptors are rapidly adapting – phasic.
Image of page 6
Gustatory Sense Taste buds are composed of 3 types of cells: Supporting cells Epithelial cells, support the receptors. Gustatory receptors Epithelial cells with gustatory hair projects into taste pore. Basal cells Replace receptor and support cells. Chemicals dissolve in saliva contact gustatory hairs receptors generate impulses impulses travel via cranial nerves (V, VII, IX and X (vagus) to thalamus & hypothalamus ? to the primary gustatory area on parietal lobe of the cerebral cortex conscious perception of taste.
Image of page 7

Subscribe to view the full document.

Vision Sense Vision sense is to make brain aware of the environment. There are several structures involved: Eyeballs Eyelids Lacrimal glands
Image of page 8
Vision Sense Eyelashes & eyebrows help protect from foreign objects, perspiration & sunlight.
Image of page 9

Subscribe to view the full document.

Vision Sense – Eyelids (Palpebrae) Composed of: skin covering orbicularis oculi muscle to open and close the eye Eyelashes - hair lining the eyelids to protect the eye surface.
Image of page 10
Image of page 11
  • Fall '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes