Spinal Cord & PNS (Mixed)

Question 1

Type of Matter:

• Sensory tracts
• Discrimative touch
• Conscious proprioception

Answer 1

White matter - Dorsal column

Question 2

Pathway Function: Tectospinal Pathway (White)

Answer 2

Refelxive movement of head

Question 3

Pathway Function and End Point: Spinothalamic Pathway (White)

Answer 3

F: Conscious pain and temperature

EP: VP of Thalamus

Question 4

Pathway Function: Lateral Corticospinal Pathway (White)

Answer 4

Primary motor ouput: voluntary movement and fine motor control

MOST CROSS

(Cross in Pyramids)

Question 5

Pathway Function: Medial Corticospinal Pathway (White)

Answer 5

Same function as Lateral Corticospinal pathway HOWEVER only makes up 10% of total corticospinal pathways

DO NOT CROSS

Question 6

Function: Nucleus Dorsalis or Clark’s Column (LVII)

Answer 6

Relays unconscious proprioceptive information to cerebellum

Question 7

Function: Substantia Gelatinosa (LII)

Answer 7

Process pain information

Question 8

Rexed Laminae: Processes conscious proprioception and discriminative touch

Answer 8

Nucleus Proprius (LIII&IV)

Question 9

5 Changes in the Spinal Cord as you DESCEND

Answer 9

1. Decrease in white matter
   - MORE sensory info as you move UP, motor info descends LESS pathways needed lower down
2. Overall size decreases
3. No posterior intermediate sulcus below T2
4. Lateral horn from T1-L2
5. Anterior horn larger at C&L plexuses

Question 10

Pathway Function: Reticulospinal Pathway (White)

Answer 10

Trunk movements and postural control

Question 11

Pathway Function: Dorsal Column Pathway (White)

Answer 11

F: Discriminative touch and conscious proprioception

Question 12

Rexed Laminae: Processes pain information

Answer 12

Substantia Gelatinosa (LII)

Question 13

Pathway Function and End Point: Spinoreticular Pathway (White)

Answer 13

F: Alerting/Arousal; Unconscious Pain

EP: Reticular Area

Question 14

Type of Matter:

• Sensory
• Contains endings of sensory neurons
• Interneurons
• Cell bodies of tract cells

Answer 14

Gray matter - Dorsal horn

Question 15

Type of Matter:

• Motor
• Cell bodies of LMN

Answer 15

Gray matter - Ventral horn

Question 16

4 Clinical Signs of UMN Injury

Answer 16

1. Paresis (not complete loss or paralysis - mutliple levels coming down)
2. Spasticity
3. Hypertonia
4. Hyperreflexia

Question 17

Pathway Function: Vestibulospinal Pathway (White)

Answer 17

Trunk movements and postural control

Question 18

Pathway Function and End Point: Spinocerebellar Pathway (White)

Answer 18

F: Unconscious Proprioception

EP: Cerebellum

Question 19

Pathway Function: Rubrospinal Pathway (White)

Answer 19

Gross motor movements under voluntary control

Question 20

Rexed Laminae: Relays unconscious proprioceptive infromation to cerebellum

Answer 20

Nucleus Dorsalis or Clark’s Column (LVII)

Question 21

Location: Where rubrospinal pathway begins

Answer 21

Red Nucleus of Upper Midbrain

(Crosses Immediately)

Question 22

Type of Matter:

• From T1-L2
• Cell bodies of preganglionic sympathetic neurons

Answer 22

Gray matter - Lateral horn

Question 23

Type of Matter:

• Motor tracts
• Postural regulation

Answer 23

White matter - Anterior column

Question 24

Function: Nucleus Proprius (LIII&IV)

Answer 24

Processes conscious proprioception and discriminative touch

Question 25

4 Clinical Signs of LMN Injury

Answer 25

1. Loss of reflexes or Hyporeflexia
2. Atrophy
3. Flaccid paralysis
4. Fibrillations/Fasciculations