Question

multiple choice 1 point
an interlacing network of nerves is commonly called:
○ dermatome
○ ganglia
○ plexus
○ rami
41 multiple choice 1 point
the medulla oblongata blends into the spinal cord.
○ true
○ false
42 multiple choice 1 point
which of the following parts of a reflex arc is the site of the stimulus detection?
○ sensory receptor
○ integrating center
○ motor neuron
○ effector

Explanation:

Question (Top, about nerve network):

• Dermatome: Area of skin innervated by a spinal nerve, not a nerve network.
• Ganglia: Clusters of neuron cell bodies, not a nerve network.
• Plexus: Defined as an interlacing network of nerves (e.g., brachial plexus).
• Rami: Branches of spinal nerves, not a network.

The medulla oblongata is the inferior part of the brainstem that directly connects (blends) into the spinal cord. This is a key anatomical fact.

• Sensory receptor: Specialized to detect stimuli (e.g., touch, pain).
• Integrating center: Processes signals, not detect stimuli.
• Motor neuron: Transmits signals to effector, no detection.
• Effector: Responds to signals, no detection.

Answer:

C. plexus

Question 41 (Medulla oblongata and spinal cord):