TRIANGLES OF THE NECK

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Last updated 4:02 AM on 5/3/26
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18 Terms

1
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Anterior ∆

  • consists of two smaller triangles: muscular and carotid

boundaries:

  • anterior midline of the neck

  • superior belly of the omohyoid muscle

  • sternocleidomastoid muscles

<ul><li><p>consists of two smaller triangles: <strong>muscular </strong>and <strong>carotid</strong></p></li></ul><p>boundaries:</p><ul><li><p>anterior midline of the neck</p></li><li><p>superior belly of the omohyoid muscle</p></li><li><p>sternocleidomastoid muscles</p></li></ul><p></p>
2
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Muscular ∆

boundaries

  • anterior midline of the neck

  • superior belly of omohyoid muscle

  • sternocleidomastoid muscle

- contains the trap mm. (infrahyoid mm.) - likes like straps on neck. They include sternohyoid, omohyoid, sternothyroid, and thyrohyoid muscles. They act to stabilize the hyoid bone and larynx in swallowing and speech.

<p>boundaries</p><ul><li><p>anterior midline of the neck</p></li><li><p>superior belly of omohyoid muscle </p></li><li><p>sternocleidomastoid muscle </p></li></ul><p>- contains the trap mm. (infrahyoid mm.) - likes like straps on neck. They include sternohyoid, omohyoid, sternothyroid, and thyrohyoid muscles. They act to stabilize the hyoid bone and larynx in swallowing and speech.</p><p></p>
3
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Carotid ∆

boundaries:

  • sternocleidomastoid muscle

  • superior belly of omohyoid muscle

  • posterior belly of digastric muscle

contents:

  • carotid sheath - tube of connective tissue which contains the common carotid a., internal jugular v., and vagus n. (between and deep to the other two)

  • internal carotid a. - no branches in the neck → enters carotid foramen

  • external carotid a. - supplies branches to the face (facial a.), neck, and side of head → terminates at temple

<p>boundaries: </p><ul><li><p>sternocleidomastoid muscle</p></li><li><p>superior belly of omohyoid muscle</p></li><li><p>posterior belly of digastric muscle</p></li></ul><p>contents: </p><ul><li><p><strong>carotid sheath </strong>- tube of connective tissue which contains the common carotid a., internal jugular v., and vagus n. (between and deep to the other two)</p></li><li><p><strong>internal carotid a.</strong> - no branches in the neck → enters carotid foramen</p></li><li><p><strong>external carotid a. </strong>- supplies branches to the face (facial a.), neck, and side of head → terminates at temple </p></li></ul><p></p>
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Posterior ∆

  1. boundaries:

  • sternocleidomastoid muscle

  • clavicle

  • superior border of trapezius muscle

  1. external jugular v. - just deep to the skin

  2. phrenic n. lies on surface of anterior scalene muscle

  3. roots of brachial plexus enter into the triangle between the anterior and middle scalene muscles

<ol><li><p>boundaries:</p></li></ol><ul><li><p>sternocleidomastoid muscle </p></li><li><p>clavicle</p></li><li><p>superior border of trapezius muscle </p></li></ul><ol start="2"><li><p>external jugular v. - just deep to the skin </p></li><li><p>phrenic n. lies on surface of anterior scalene muscle</p></li><li><p>roots of brachial plexus enter into the triangle between the anterior and middle scalene muscles </p></li></ol><p></p><p></p>
5
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olfactory

sensory, cribriform plate

6
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optic

sensory, optic foramen

7
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oculomotor

motor, superior orbital fissure

8
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trochlear

motor, superior orbital fissure

9
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maxillary division of trigeminal nerve

sensory, foramen rotundum

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ophthalmic division of trigeminal nerve

sensory, superior orbital fissure

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mandibular division of trigeminal nerve

sensory and motor, foramen ovale

12
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abducens nerve

motor, superior orbital fissure

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facial nerve

sensory and motor, internal auditory meatus and stylomastoid foramen

14
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vestibulocochlear

sensory, internal auditory meatus

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glossopharyngeal

sensory and motor, jugular foramen

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vagus

sensory and motor, jugular foramen

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spinal accessory

motor, jugular foramen

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hypoglossal

motor, hypoglossal foramen