Anterior Triangle 1 Flashcards

1
Q

Origin, Insertion, action, innervation of Mylohyoid

A

Origin - mylohyoid line on mandible
Insertion - body of hyoid (and fibres of mylohyoid on other side)

Innervation - nerve to mylohyoid (branch of IAN)

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2
Q

Origin, Insertion, Action, innervation Digastric (posterior and anterior)

A

Left and right digastric muscle, each with a posterior and anterior muscle.
Origin
Anterior - medial aspect of mandible
Posterior - medial side of mastoid process (temporal bone)
Insertion - attachment of their intermediate tendon at hyoid

Innervation
Anterior - nerve to mylohyoid (branch of IAN)
Posterior - digastric branch of facial nerve (CNVII)

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3
Q

Origin and insertion stylohyoid

A

origin - styloid process
Insertion - body of hyoid
Action - elevates hyoid bone - pulls up

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4
Q

Origin and insertion geniohyoid

A

Origin - mental spine of mandible
Insertion - Body of hyoid (located superior to mylohyoid)

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5
Q

What nerve(s) innervates the infrahyoid muscles?

A

Omohyoid, sternohyoid, sternothyroid - The anterior rami of C1-C3 via the ANSA CERVICALIS.

Thyrohyoid - anterior rami of C1 but fibres that are carried with the hypoglossal nerve

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6
Q

Origin, insertion, innervation sternothyroid

A

Origin - posterior surface of the manubrium of the sternum
Insertion - Oblique line on thyroid cartilage
Innervation - Anterior rami of C1-C3 - ANSA CERVICALIS

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7
Q

Origin, insertion, innervation thyrohyoid

A

Origin - oblique line on thyroid cartilage
Insertion - Greater horn and body of hyoid bone
Innervation - Anterior rami of C1 - fibres that run with hypoglossal nerve (CNXII)

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8
Q

What artery supplies the parathyroid glands?

A

Inferior thyroid arteries.
NB Venous drainage - superior, middle and inferior thyroid vein.

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9
Q

What nerve innervates the parathyroid glands?

A

Thyroid branches from the cervical sympathetic ganglion (CNVII)

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10
Q

Origin and Insertion of the omohyoid (inferior and superior belly)

A

Superior
Origin - intermediate tendon (fascial sling)
Insertion - Body of the hyoid bone

Inferior
Origin - Superior border of scapula near suprascapular notch
Insertion - intermediate tendon (fascial sling)

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11
Q

Origin and insertion sternohyoid

A

Origin - manubrium of sternum
Insertion - body of the hyoid

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12
Q

What are the boundaries of the anterior triangle?

A

Mid-line of the neck
Anterior border of the SCM
Inferior border of the mandible

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13
Q

What is the action of the mylohyoid?

A

Elevates the hyoid bone and depresses the mandible

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14
Q

What veins drain into the external jugular vein?

A

Posterior external jugular
Anterior jugular
Suprascapular
Transverse cervical

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15
Q

Innervation of geniohyoid

A

Anterior rami of C1 but fibres travel with hypoglossal nerve

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16
Q

Innervation of stylohyoid

A

facial nerve

17
Q

Innervation to mylohyoid

A

Nerve to mylohyoid