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Head & Neck - Anatomy (Year 2) > W1: S7 - The Hyoid Bone, Strap Muscles of the Neck and Cervical Plexus > Flashcards

W1: S7 - The Hyoid Bone, Strap Muscles of the Neck and Cervical Plexus Flashcards

1
Q

Identify the parts of the hyoid bone

A
  • A. Middle pharyngeal constrictor muscle origin
  • C. Hyoglossus muscle origin
  • D. Greater Horn
  • E. Lesser Horn
  • F. Body of hyoid
  • G. Stylohyoid ligament.
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2
Q

What are the muscles/sets of muscles that attach to the hyoid bone?

A
  1. Suprahyoid muscles
  2. Infrahyoid muscles
  3. Hypoglossal muscle and genioglossus (muscle of tongue)
  4. Middle pharyngeal contracter (muscle of pharynx)
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3
Q

What are the 4 suprahyoid muscles? (MA DAD SELLS GAVISCON)

A
  • Myolohyoid
  • Digastric
  • Stylohyoid
  • Geniohyoid
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4
Q

What is the nerve supply of the myolohyoid muscle?

A

Myolohyoid nerve (V3)

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5
Q

What is the nerve supply of the geniohyoid muscle?

A

Hypoglossal nerve (C1)

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6
Q

What two nerves supply the digastric muscles?

A
  1. Myolohyoid nerve (trigeminal) [anterior belly]
  2. Facial nerve [posterior belly]
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7
Q

What nerve supplies the stylohyoid?

A

Facial nerve

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8
Q
A
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9
Q

What is the action of the suprahyoid muscles on the mandible and hyoid bone?

A

Depression of the mandible and elevation of the hyoid bone

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10
Q

What are the 4 infrahyoid muscles? TOSS

A
  • T - Thyrohyoid
  • O - Omohyoid
  • S - Sternohyoid
  • S - Sternothyroid
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11
Q

What is the nerve supply of the thyrohyoid?

A

C1 via the hypoglossal nerve

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12
Q

What is the nerve supply of the omohyoid?

A

C2, C3

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13
Q

What is the nerve supply of the sternothyroid and sternohyoid muscles?

A

C2, C3

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14
Q

What is C2, C3 better known as?

A

Ansa Cervalis

  • Loop of nerves that are part of cervical plexus lying superficial to IJV
  • Innervate infrahyoid muscles except thyroid which is innvervated by C2 via hypoglossal
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15
Q

What action do the infrahyoid muscles have on the hyoid bone?

A
  • Depression
  • Stabilisation
    • during swallowing
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16
Q

What are the vertebral root values of the cervical plexus?

A

C1 - C5

17
Q

Between which two muscles does the cervical plexus emerge?

A

“The cervical plexus is formed in the neck, and lies deep to the sternocleidomastoid muscle, and anterolateral to the levator scapulae and middle scalene muscles.”

18
Q

What nerve arises from the cervical plexus and travels through the thorax?

A
  • Phrenic nerve
    • Also has afferent fibres from pericardium

Head & Neck - Anatomy (Year 2) (19 decks)

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