SPCH Hearing Anatomy

Power of Speech and Support

• Ability to speak into people's lives and support families, children, spouses, and show God's love.

• Conduct in professional settings (e.g., SLIPA internship) is an important aspect.

• Committing to a major is a step towards the future, and faith in God is essential for overcoming challenges.

Community and Care

• California Baptist University (CBU) is highlighted as a place with strong support and love rooted in Christ.

• The speaker expresses genuine care and willingness to help students succeed.

• Encouragement to persevere through challenges within the course context.

Course Content

• The course is focused on the anatomy and physiology of relevant muscles rather than therapy assessment.

• Discussion about the muscles of the mandible (jawbone) and their functions.

• Emphasis on anatomy labs to enhance understanding of specific muscles like the masseter and temporalis.

Muscular Anatomy of the Mandible

• Masseter Muscle:

  • Location: Zygomatic arch to the mandible.

  • Function: Elevates the mandible when chewing.

  • Experiential learning: Feel the muscle contraction during jaw movement.

• Temporalis Muscle:

  • Location: Temporal bone to mandible.

  • Function: Elevates and retracts the mandible.

  • Remember: Shape resembles a seashell.

• Pterygoid Muscles:

  • Internal Pterygoid:

    • Location: Skull and palatine bone to mandible.

    • Function: Forms a sling for improved muscle movement.

  • External Pterygoid:

    • Location: Sphenoid bone to condyle.

    • Function: Allows forward and rotary chewing motions.

    • Clinical application: Rotary chewing is important in child feeding and speech development.

• Digastric Muscle:

  • Function: Pulls down the mandible.

• Mylohyoid Muscle:

  • Function: Acts as a floor of the mouth and influences movement of the hyoid bone.

• Geniohyoid Muscle:

  • Location: Mandible to hyoid bone.

  • Function: Assists with downward mandible movement.

Movement and Function Integration

• All discussed muscles contribute to basic actions like mastication (chewing) and speech.

• Understanding how to identify and perform muscle functions is crucial for practical application in therapy.

Anatomy of the Tongue

• Description of Intrinsic vs. Extrinsic tongue muscles.

  • Intrinsic Muscles: Control fine movements (e.g., curling, flattening).

  • Extrinsic Muscles: Larger movements (e.g., positioning the tongue in the mouth).

• Key intrinsic muscles:

  • Superior and Inferior Longitudinal (lengthening/shortening).

  • Vertical (flattening).

  • Transverse (narrowing).

• Key extrinsic muscles:

  • Genioglossus: Moves tongue forward/backward.

  • Hyoglossus: Lowers tongue.

  • Styloglossus: Raises tongue.

  • Palatoglossus: Moves tongue up and backward.

Oral Muscles for Facial Expression

• Orbicularis Oris: The only intrinsic muscle of the lips; crucial for lip movement, closure, and expression.

• Extrinsic Facial Muscles: Several muscles involved in lip movements and facial expressions.

  • Buccinator: Helps with lip closure and maintaining cheek position.

  • Risorius: Draws the mouth corners back (smiling).

  • Zygomatic Major and Minor: Elevates corners of the mouth.

  • Levator Labii Superioris: Lifts upper lip.

  • Platysma: Helps with facial expression and movement of the lower lip.

Clinical Relevance

• Understanding these muscles is vital in speech therapy and developmental speech practices.

• The speaker shares personal experiences to highlight the importance of these lessons in practical settings.