Podcast
Questions and Answers
Which component detects the stimulus and initiates the reflex in a somatic reflex arc?
Which component detects the stimulus and initiates the reflex in a somatic reflex arc?
In a polysynaptic reflex, which structure is primarily involved in processing the sensory input?
In a polysynaptic reflex, which structure is primarily involved in processing the sensory input?
What is the role of the ventral root in the reflex arc?
What is the role of the ventral root in the reflex arc?
Which reflex is classified as a monosynaptic reflex?
Which reflex is classified as a monosynaptic reflex?
Signup and view all the answers
Which structure carries sensory information from the receptor to the spinal nerve?
Which structure carries sensory information from the receptor to the spinal nerve?
Signup and view all the answers
What occurs during reciprocal inhibition in a reflex?
What occurs during reciprocal inhibition in a reflex?
Signup and view all the answers
Which cranial nerve is categorized as purely motor?
Which cranial nerve is categorized as purely motor?
Signup and view all the answers
The effect of a withdrawal/flexor reflex is primarily to achieve what?
The effect of a withdrawal/flexor reflex is primarily to achieve what?
Signup and view all the answers
Study Notes
Somatic Reflex Arc Components
- Receptor (Sensory Input): Detects stimulus (e.g., pain, stretch). Located in the periphery and involves the dorsal root transmitting the signal to the spinal cord.
- Afferent (Sensory) Pathway: Peripheral nerve carries sensory information from the receptor to the spinal nerve. The dorsal root is involved.
- Integration Center (Processing in the Spinal Cord): Occurs in the spinal cord's gray matter. Relays to an interneuron (polysynaptic reflex) or a motor neuron (monosynaptic reflex).
- Efferent (Motor) Pathway: Ventral root transmits motor output from spinal cord to spinal nerve. May travel through a plexus to reach the appropriate muscle in limb reflexes. Peripheral nerve carries the signal to the effector muscle.
- Effector (Motor Output): Muscles or glands respond to the stimulus (e.g., muscle contraction).
Cranial Nerves Classification
- Olfactory: Sensory
- Optic: Sensory
- Oculomotor: Motor
- Trochlear: Motor
- Trigeminal: Mixed
- Abducens: Motor
- Facial: Mixed
- Vestibulocochlear: Mixed
- Glossopharyngeal: Mixed
- Vagus: Mixed
- Spinal Accessory: Motor
- Hypoglossal: Motor
Not a Characteristic of the PNS (Missing Information)
- No information provided.
Reflexes
-
Withdrawal/Flexor Reflex:
- Receptor: Pain or tactile receptor
- Stimulus: Pain or touch
- Type: Polysynaptic
- Effect: Contraction of flexor muscle.
- Example: Pain reflex
-
Cross Extensor Reflex:
- Receptor: Pain or tactile receptor
- Stimulus: Pain or touch
- Type: Polysynaptic
- Effect: Contraction of extensor on the opposite side of the stimulus.
- Continuation: Part of the withdrawal reflex
-
Stretch Reflex:
- Receptor: Muscle spindle
- Stimulus: Muscle stretch
- Type: Monosynaptic
- Effect: Muscle contraction.
- Example: Knee-jerk reflex
-
Reciprocal Inhibition:
- During a movement, the agonist muscle contracts, while the opposing antagonist muscle relaxes, enabling the movement.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on the components of the somatic reflex arc and the classification of cranial nerves. This quiz covers sensory and motor pathways, as well as the roles of receptors, integration centers, and effectors. Perfect for students of biology or anatomy.
