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Zak, Anatomy > Nerve Plexi > Flashcards

Nerve Plexi Flashcards

0
Q

What are the characteristics of Intercostal Nerves

A

Come from anterior Rami
Between the ribs
Have lateral and anterior branches
*Intercostobrachial (T2) has a lateral branch that runs from torso to armpit
*Subcostal Nerves=T12 nerves b/c they are under the floating ribs (not b/w ribs)

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1
Q

What are the 3 ways in which spinal nerves are distributed in the body

A

1) Intercostal Nerves
2) Dorsal Rami
3) Spinal Nerve Plexuses

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2
Q

Dorsal Rami are also known as…

A

Posterior Rami

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3
Q

Ventral rami are also known as…

A

Anterior rami

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4
Q

Nerve Plexuses

A

Interweaving anterior rami of spinal nerves
They split into various “named” nerves that innervate various body structures
Main Plexuses=Cervical, Brachial, Lumbar, & Sacral

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5
Q

Cervical Plexus

A

C1-5, Consists of nerve branches
Hypoglossal, Accessory, Lesser Occipital, Great Auricular, Transverse Cervical, Ansa Cervicalis, Supraclavicular, Phrenic, & Branch to Brachial Plexus

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6
Q

What nerve extension of the cervical plexus controls motor muscles of the front of the neck?

A

Ansa Cervicalis (C2/C3)

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7
Q

C1 of the cervical plexus has which nerve(s)?

A

Hypoglossal & Accessory Nerves

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8
Q

C2 of the cervical plexus has which nerve(s)?

A

Lesser Occipital & the Superior and Inferior roots of the Ansa Cervicalis

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9
Q

C3 of the cervical plexus has which nerve(s)?

A

Greater auricular, Transverse cervical, & Phrenic nerve

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10
Q

C4 of the cervical plexus has which nerve(s)?

A

Supraclavicular Nerves & Branch to Brachial Plexus

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11
Q

C5 of the cervical plexus has which nerve(s)?

A

Mainly brachial plexus

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12
Q

What do cervical nerves 3-5 control?

A

Diaphgram

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13
Q

Brachial Plexus

A

Consists of C5-T1 and 5 main nerves

Musculotaneous nerve, Axillary nerve, Radial nerve, Median nerve, & Ulnar nerve

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14
Q

What are the 5 components of the nerves in the brachial plexus?

A 
Real Texans Drink Cold Beer
Roots
Trunks
Divisions
Cords
Branches
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15
Q

C5 of the brachial plexus has which nerve(s)?

A

Musculotaneous nerve, Median nerve, & Long thoracic nerve

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16
Q

C6 of the brachial plexus has which nerve(s)?

A

Musculotaneous nerve, Median nerve, & Long thoracic nerve

17
Q

C7 of the brachial plexus has which nerve(s)?

A

Musculotaneous nerve, Median nerve, Axillary and Radial nerves, and Long thoracic nerve
*Axillary and Radial nerves are dorsal nerves

18
Q

C8 of the brachial plexus has which nerve(s)?

A

Contributions to Axillary, Radial, & Median nerve…Contains Ulnar nerve

19
Q

T1 of the brachial plexus has which nerve(s)?

A

Contributions to Ulnar nerve and Long thoracic nerve

20
Q

In the brachial plexus, which nerves (of 5 main) go Lateral, Medial, & Posterior?

A

Lateral- Musculotaneous & Median
Medial- Ulnar & Median
*Lateral and Medial nerves are also anterior nerves
Posterior- Radial & Axillary

21
Q

Lumbar Plexus

A

L1-L4 & contains 6 major nerves

*L5 unites lumbar plexus and sacral plexus (Lumbrosacral Trunk)

22
Q

L1 of the Lumbar plexus has which nerve(s)?

A

Iliohypogastric & Ilioinguinal nerves & contributions to Genitofemoral nerve

23
Q

L2 of the lumbar plexus has which nerve(s)?

A

Contributions to Genitofemoral, Lateral femoral cutaneous, & Femoral nerves

24
Q

L3 of the lumbar plexus has which nerve(s)?

A

Contributions to the Lateral Femoral Cutaneous, Femoral, & Obturator nerves

25
Q

L4 of the lumbar plexus has which nerves?

A

Lumbosacral nerve (connects lumbar and sacral plexuses)

26
Q

L5 of the lumbar plexus has which nerves?

A

Lumbosacral trunk & component of sciatic nerve

27
Q

Sacral Plexus

A

L5-S4, contains 6 main nerves

28
Q

L5 of sacral plexus contains which nerves?

A

Lumbosacral trunk & component of the sciatic nerve

29
Q

S1 of the sacral plexus contains which nerves?

A

Contributions to the Superior gluteal, Inferior gluteal, Posterior femoral cutaneous, & both the Common fibular division & the Tibial division of the sciatic nerve

30
Q

S2 of the sacral plexus contains which nerves?

A

Contributions to the Inferior gluteal, Piriformis, Posterior femoral cutaneous, Pudendal, & both the Common fibular and Tibial divisions of the sciatic nerve

31
Q

S3 of the sacral plexus contains which nerves?

A

Contributions to the Posterior femoral cutaneous, Pudendal, & Tibial division of sciatic nerve

32
Q

S4 of the sacral plexus contains which nerves?

A

Pudendal nerve

33
Q

What are the characteristics of Reflexes?

A

Rapid, automatic, involuntary reactions of muscles or glands to a stimulus
Awareness of stimulus occurs after reflex action has completed
Have 3 main properties

34
Q

What are the 3 main properties of Reflexes?

A

Stimulus: A stimulus is required to initiate a response
Rapid Response: Few neurons are involved and synaptic delay is minimal
Automatic Response: Occurs the same way every time

35
Q

Ipsilateral Arc

A

When both receptor and effector organs of the reflex are on the same side of the spinal cord
EX: Left arm muscles contract to move left hand off something hot

36
Q

Contralateral Arc

A

Sensory impulses from receptor organ cross over the spinal cord to activate the effector organ on the opposite side
EX: Step on sharp object with right foot and muscles in left leg contract to help you balance as you raise your right foot

37
Q

Monosynaptic Reflexes

A

Interneurons are not involved

EX: Patellar knee jerk…muscle spindles in the quadriceps are stretched upon tapping with reflex hammer

38
Q

Polysynaptic Reflex

A

Complicated neural pathways that exhibit a number of synapses involving interneurons with the reflex arc
EX: Pulling hand away from hot stove

39
Q

Stretch Reflexes

A

Monosynaptic reflexes where if a stimulus results in stretching of a muscle, that muscle reflexively contracts
EX: Patellar knee reflex

40
Q

Golgi Tendon Reflex

A

Prevent skeletal muscles from tensing excessively
Nerve endings near muscle-tendon junctions
When activated, signal is sent to CNS that inhibits the action of the motor neurons and causes the muscle to relax

Zak, Anatomy (18 decks)

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