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Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMartini, Nath, Bartholomew 11th EditionCh. 13 The Spinal Cord, Spinal Nerves, and Spinal ReflexesProblema 3
Capitolo 13, Problema 3

Spinal nerves are called mixed nerves because they
(a) Contain sensory and motor fibers
(b) Exit at intervertebral foramina
(c) Are associated with a pair of spinal ganglia
(d) Are associated with posterior and anterior roots

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1
Understand the term 'mixed nerves' in the context of spinal nerves. Mixed nerves are those that carry both sensory (afferent) and motor (efferent) fibers.
Recall the anatomy of spinal nerves: they arise from the spinal cord and contain fibers from both the dorsal (posterior) root, which carries sensory information, and the ventral (anterior) root, which carries motor information.
Analyze each option: (a) states that spinal nerves contain sensory and motor fibers, which aligns with the definition of mixed nerves.
(b) mentions the exit point of spinal nerves (intervertebral foramina), which is true but does not define why they are called mixed nerves.
(c) refers to spinal ganglia, which are associated with sensory neurons but do not explain the mixed nature of the nerve.
(d) mentions association with posterior and anterior roots, which is related to their structure but the key reason they are mixed nerves is the presence of both sensory and motor fibers.

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Mixed Nerves

Mixed nerves contain both sensory (afferent) and motor (efferent) fibers, allowing them to transmit signals to and from the central nervous system. This dual function enables coordination of sensory input and motor output within the same nerve.
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Nerves and Blood Supply

Spinal Nerve Anatomy

Spinal nerves emerge from the spinal cord through intervertebral foramina and are formed by the union of dorsal (sensory) and ventral (motor) roots. This anatomical structure is essential for their mixed function.
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Nerves and Blood Supply

Spinal Ganglia and Roots

Spinal ganglia (dorsal root ganglia) contain the cell bodies of sensory neurons, while anterior (ventral) roots carry motor fibers. The association of these roots and ganglia explains the mixed nature of spinal nerves.
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Sympathetic Nervous System Example 3
Pratica correlata
Domanda del libro di testo

A sensory region monitored by the posterior rami of a single spinal segment is

(a) A ganglion

(b) A fascicle

(c) A dermatome

(d) A ramus

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The major nerve of the cervical plexus that innervates the diaphragm is the

(a) Median nerve

(b) Axillary nerve

(c) Phrenic nerve

(d) Common fibular nerve

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Domanda del libro di testo

The following are the steps involved in a neural reflex.

1. Activation of a sensory neuron

2. Activation of a motor neuron

3. Response by an effector

4. Arrival of a stimulus and activation of a receptor

5. Information processing

The proper sequence of these steps is

(a) 1, 3, 4, 5, 2

(b) 4, 5, 3, 1, 2

(c) 4, 1, 5, 2, 3

(d) 4, 3, 1, 5, 2

(e) 3, 1, 4, 5, 2

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Domanda del libro di testo

The anterior roots of each spinal segment

(a) Bring sensory information into the spinal cord

(b) Control peripheral effectors

(c) Contain the axons of somatic motor and visceral motor neurons

(d) Do both b and c

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