Nervous supply Flashcards
Which roots of the spinal cord are “sensory” ?
Ascending tracts
Which roots of the spinal cord are “motor”?
Descending tracts
2 major functions of the Spinal nerves
- A pathway for sensory and motor impulses
- Responsible for reflexes—our quickest reactions to stimuli
The posterior/Dorsal root is
______________ in nature
“sensory” in nature
Anterior/Ventral root is _________ in nature?
“motor” in nature
Why are the spinal nerves considered as “mixed” nerves
The combination of both sensory and motor fibers within a single spinal nerve makes it a mixed nerve,
A mixed nerve is called
Spinal nerve trunk.
Each large branch is named a ____1_____ and can be _____2______ and ______3________
- Ramus
- Anterior &
- Posterior ramus).
Name of the brachial plexus, its location in the spinal cord
5 Brachial plexus
1. Axillary Nerve
2. Median Nerve
3. Musculocutaneous Nerve
4. Radial Nerve
5. Ulnar Nerve
Location in the spinal cord is:
the neck region,
specifically the 5th to 8th cervical nerves and 1st thoraic nerve.
(C5-C8) - (T1)
_____________ are networks of nerves that supply the upper limbs.
Brachial plexuses
Axons from the _____1_____ of spinal nerves form a network on both the left & right of the body by joining various numbers of axons. This network of axons is _______2_______
- Anterior rami
- The spinal plexus.
Each plexus is formed by ____________ of spinal nerves C5–T1
the anterior rami
Each brachial plexus innervates ______________ and the ____________
- the pectoral girdle
- the entire upper limb of one side
Axillary Nerve Innervates muscles in the _______
Deltoid, Teres minor muscles and superiolateral arm
Median Nerve Innervates muscles in the ________
Most anterior forearm muscles, thenar (thumb) muscles and lumbricals. Palmar aspects and dorsal tips of lateral 3-1/2 digits
Musculocutaneous Nerve innervates muscles in the _________
“Anterior arm muscles including the biceps brachii, brachialis, and coracobrachialis, and the lateral region of the forearm.
Radial Nerve innervates muscles in the
Posterior arm and forearm muscles, including the triceps brachii, anconeus, and the muscles responsible for wrist and finger extension.
Ulnar Nerve innervates muscles in the ____________
Anterior forearm muscles, intrinsic hand & dorsal and palmar aspects of medial 1-1/2 digits (little finger, medial aspect of ring finger)
