Sensory Receptors Physiology | Basic Introduction to CNS and PNS
A physiology video packed with in-depth knowledge is here once more.
The subject at hand is sensory receptors.
In this video, we'll talk about the physiology of the senses, various skin receptor types, sensory receptors in the ear, and human sensory receptors.
▬ 🕘 Timestamps
00:00 - Sensory Receptors Physiology
00:35 - Nervous System Overview
02:59 - Sensory Receptors
04:13 - Link to video lectures on sqadia.com
▬ 📌 Sensory Receptors
The sensory receptors of the peripheral nervous system are specialized to respond to stimuli. The sensory system consists of the following types of receptors:
🔹Mechanoreceptors
🔹Thermoreceptors
🔹Pain receptors
🔹Chemoreceptors
🔹Photoreceptors
You will easily memorize them using a mnemonic. For this, you have to watch our physiology video.
▬ 📌 Cutaneous Receptors
The skin is composed of two layers:
🔸Epidermis
🔸Dermis
👉Types of Cutaneous Receptors
There are the following types of cutaneous receptors.
✫ Meissner corpuscles
✫ Merkel disks
✫ Root hair plexus
✫ Pacinian corpuscles
✫ Ruffini endings
✫ Krause end bulbs
▬ 📌 Proprioceptors
The Proprioceptor system is involved in reflex actions that maintain muscle tone and thereby the body’s equilibrium and posture. The two forms of proprioceptors are called:
🔹Muscle spindles
🔹Golgi tendon organs
▬ 📌 Nociceptors
Fibers of Nociceptors are of the following types:
🔸Fast Pain Fiber
🔸Slow Pain Fiber
▬ 📌 Sense of Taste
When you taste food, it activates chemoreceptors called taste buds. We have at least five primary types of taste sensations:
🔹Sweet
🔹Sour
🔹Salty
🔹Bitter
🔹Umami
👉Types of Papillae
There are the Following types of Papillae
✧ Vallate papillae
✧ Foliate papillae
✧ Filiform papillae
✧ Fungiform papillae
▬ 📌 Sense of Smell
Our sense of smell is dependent on:
🔹Olfactory epithelium
🔹Olfactory cells
🔹Neurons
🔹Olfactory cilia
🔹Temporal lobe
▬ 📌 Sense of Vision
The photoreceptors for sight are in the eyes. The eyes are located in spherical chambers called orbits. Orbits are formed by the skull’s bones called:
✦ Frontal
✦ Lacrimal Bone
✦ Ethmoid Bone
✦ Zygomatic Bone
✦ Maxilla
✦ Sphenoid Bone
▬ 📌 Extrinsic Muscles
Within an orbit, the eye is anchored in place by the extrinsic muscles whose contractions move the eyes. Each of these muscles originates from the bony orbit and is inserted by tendons to the outer layer of the eyeball. There are three pairs of antagonistic extrinsic muscles:
The first pair consists of:
📍Superior rectus
📍Inferior rectus
The second pair consists of:
📍Lateral rectus
📍Medial rectus
The third pair consists of:
📍Superior oblique
📍Inferior oblique
▬ 📌 Sense of Vision
The eye consists of:
✨Sclera
✨Choroid
✨Retina
✨Cornea
✨Iris
✨Pupil
✨Ciliary Body
✨Ciliary Muscle
✨Lens
✨Suspensory Ligaments
✨Aqueous Humor
✨Suspensory Ligaments
✨Vitreous Humor
✨Cone
✨Rods
✨Macula Lutea
✨Optic Disk
✨Optic Nerve
✨Retinal Blood Vessels
▬ 📌 Sense of Hearing
The ear has two sensory functions:
✧ Hearing
✧ Equilibrium or balance
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