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Anatomy 3 final (practical and oral part) > Practical topic 13 > Flashcards

Practical topic 13 Flashcards

The root of plexus brachialis and branches at this level, mm. scaleni, a. et lc. axillaris

1
Q

Which muscles does mm. Scaleni consist of?

A
  • M. scalenius dorsalis
  • M. scalenius medius
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2
Q

M. scalenius dorsalis

A

Origin: From c4-6 on transverse process.

Insertion:

  • Has two muscular parts, inserting on the cranial border of ribs:
    • Dorsally situated:
      • Rib 1-4.
    • Ventrally situated:
      • Rib 1-8/9.

Action:

  • Helps inspiration.
  • Bilateral contraction: flexes neck ventrally.
  • Unilateral contraction: flexes neck laterally.
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3
Q

M. scalenius medius

A

Origin: From c6-7 on transverse process.

Insertion: Rib 1, cranial border.

Action:

  • Helps inspiration.
  • Bilateral contraction: flexes neck ventrally.
  • Unilateral contraction: flexes neck laterally.
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4
Q

Give the parts of lc. axillaris

A
  • Ln. axillaris proprii
    • Caudal to the shoulder joint in the bifurcation of the axillary and subscapular arteries
  • Ln. axillaris accessorius
    • Against the 3 rd or 4 th ribs at the level of the lateral thoracic vein
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5
Q

The thoracic limb is abducted

A
  1. M. scalnus
  2. M. capitis longitudinalis
  3. M. serratus ventralis
  4. M. obliquus abdominalis externus
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6
Q
A
  • →Ventral branches of spinal nerves C6 to T1 from plexus brachialis
  • *C5 ventral branches
  1. N. cleidobrachialis
  2. N. suprascapularis
  3. N. musculocutaneous
  4. N. axillaris
  5. N. radialis
  6. N. mediana
  7. N. ulnaris
  8. N. thoracodorsales
  9. N. phrenicus
    • Entering the thoracic cavity
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7
Q
A
  • → Ventral branches of spinal nerves C6 to T1 feed into the brachial plexus
  • * C5 ventral branch
  1. N. ulnaris together with n. medan
  2. N. musculocutaneous
  3. N. radialis
  4. N. axillaris
  5. N. subscapularis
  6. N. thoracodorsalis
  7. N. phrenicus
    • Entering the thoracic cavity
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8
Q

Cranial view of brachial plexus

A
  • → Ventral branches of spinal nerves C6 to T1 feed into the brachial plexus
  • * C5 ventral branch
  1. N. suprascapularis
  2. N. cleidobrachialis
  3. N. subscapularis
  4. N. axillaris
  5. N. musculocutaneus
  6. N. radialis
  7. N. mediana
  8. N. ulnaris
  9. N. phrenicus
    • Entering the thoracic cavity
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9
Q

Craniomedial view

A
  1. N. musculocutaneous
    • Innervates m. coracobrachialis, m. biceps brachii and m. brachialis
  2. M. coracobrachialis
  3. M. biceps brachii
  4. M. brachialis
  5. Communicating branch from n. musculocutaneous to the median nerve
    • Ends at n. medialis cutaneous antebrachii
  6. N. medialis cutaneous antebrachii
  7. N. mediana
    • Originate from a common trunk with n. ulnaris
  8. N. ulnaris
    • Originate from a common trunk with n. mediana
  9. Common trunk for n. mediana and n. ulnaris
  10. N. antebrachii caudalis cutaneous
    • From n. ulnaris
  11. N. radialis
  12. N. thoracodorsalis
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10
Q

A. axillaris

A
  1. Truncus brachiocephalicus
  2. Aa. carotis communis dextra et sinistra
  3. A. subclavia dextra
  4. A. axillaris
    • Goes from a. subclavia to a. axillaris lateral to the first rib
  5. A. thoracica externa
  6. A. thoracica lateralis
  7. A. subscapularis
  8. A. circumflexa humeri cranialis
  9. A. brachialis
    • Goes from a. axillaris to a. brachialis after a. circumflexa humeri cranialis
  10. A. cervicalis superficialis
  11. A. thoracica interna
  12. A. vertebralis
  13. Truncus costocervicalis
  14. V. jugularis externa dextra
  15. V. brachiocephalica dextra
  • ⇉ Vena cava cranialis
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11
Q
A
  1. N. suprascapularis
  2. Nn. subscapularis
  3. N. axillaris
  4. N. thoracodorsalis
  5. N. radialis
  6. A et V. brachialis, N. ulnaris, N. medianus
  7. V. axillaris
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12
Q
A
  1. nn. subscapularis
  2. N. axillaris
  3. V. axillaris
  4. A., V. et N. thoracodorsalis
  5. N. radialis
  6. N. ulnaris et. N. cutaneous antebrachii caudalis
  7. N. medianus
  8. A. brachialis
  9. N. musculocutaneous
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13
Q
A
  1. Nn. subscapularis
  2. N. axillaris (has multiple branches)
  3. N. thoracodorsalis
  4. A. thoracodorsalis
  5. N. radialis
  6. N. musculocutaneous
  7. A. brachialis
  8. N. medianus
  9. N. ulnaris et N. cutaneous antebrachii caudalis
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14
Q

Give the nerves in the root of the brachial plexus, and which trunk they are arising from

A
  • N. subscapularis
    • C6-C7
  • N. suprascapularis
    • C6
  • N. musculocutaneous
    • C7
  • N. axillaris
    • C6-C7
  • N. radialis
    • C7-Th1+2
  • N. mediana + n. ulnaris
    • From common trunk
    • N. mediana: C7-Th1
    • N. ulnaris: C8-Th2
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Anatomy 3 final (practical and oral part) (128 decks)

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