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Biology 323 Human Anatomy for Biology Majors Lecture 18 Dr. Stuart S. Sumida - PowerPoint PPT Presentation


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Biology 323 Human Anatomy for Biology Majors Lecture 18 Dr. Stuart S. Sumida. From the Head to the Neck (or was it from the body to the neck?). Carotid Sheath: Carotid Artery Jugular Vein Vagus Nerve Do you remember what foramina these pass through?!. Superior Pharyngeal

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Biology 323

Human Anatomy for Biology Majors

Lecture 18

Dr. Stuart S. Sumida

From the Head to the Neck

(or was it from the body to the neck?)


  • Carotid Sheath:

  • Carotid Artery

  • Jugular Vein

  • Vagus Nerve

  • Do you remember what foramina these pass through?!


Superior Pharyngeal

Constrictor (attaches to

Pterygomandibular raphe’)

Middle Pharyngeal

Constrictor (attaches to

Hyoid bone)

Inferior Pharyngeal

Constrictor (attaches to

Thyroid and cricoid cartilages)


Phonation speaking
Phonation(Speaking)


Phonation articulation
Phonation & Articulation

  • Glottis closes

    • Recurrent laryngeal nerve from CN X

  • Air is forced through the glottis

    • Vocal folds vibrate and produce a constant tone (phonation)

  • Pitch of the tone depends on:

    • Diameter, length, tension of vocal folds (CN X)


Glottis

closed

Epiglottis

Vocal folds


Strap muscles aid in phonation

Sternothyroid

(depresses larynx)

Thyrohyoid

(depresses hyoid or

raises larynx)

Geniohyoid

(elevates hyoid or

depresses jaw)

Sternohyoid

(depresses hyoid)

“Strap” MusclesAid in Phonation

Sternum


X

Pathways of the Vagus Nerve (CN X)

Sensory

Parasympathetic

Jugular

foramen

Branchial Motor

Hyoid bone

Pharyngeal

Constrictor

Muscles

Laryngeal

Muscles

Thyroid cartilage

(Laryngeal cartilage)

Cricoid

cartilage

Recurrent

laryngeal

nerve

Esophagus


Phonation articulation1
Phonation & Articulation

  • The tone is articulated into voice.

    • Tone depends on:

      • Size and shape of the oropharynx and nasopharynx

      • Position of jaw (CN V3), tongue (CN XII), and lips (CN VII)



Anterior

Posterior


Anterior

Posterior


Posterior

Anterior


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