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LIF101 Anatomy

LIF101 Anatomy. Lecture 9: Eye, Nose, Mouth, Ear, Anterior Torso Musculature and Surface Features. The Mouth. A.K.A. oral cavity Lips arch back from midline and bend around dental arches Color is due to thin, translucent skin and rich blood supply. Parts of the Mouth.

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LIF101 Anatomy

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  1. LIF101Anatomy Lecture 9: Eye, Nose, Mouth, Ear, Anterior Torso Musculature and Surface Features

  2. The Mouth • A.K.A. oral cavity • Lips arch back from midline and bend around dental arches • Color is due to thin, translucent skin and rich blood supply

  3. Parts of the Mouth • Tubercle of upper lip • Wings of upper lip • Groove of lower lip • Lobes of lower lip • Corners • Philtrum

  4. Parts of the Mouth • Red margins • Philtrum • Nasolabial furrows (smile furrows) • Mentolabial furrow

  5. The Teeth • Usually 32 total • Lie in sockets ca lled alveoli • Most upper teeth larger than lower • Upper teeth usually overbite slightly • Upper teeth generally more visible

  6. Outer Ear Structure • Bowl and double rim • Conducts sound waves into auditory meatus • Mostly cartilage, but lobe is filled with fat tissue.

  7. Parts of the Outer Ear • Auditory meatus • Concha • Helix (and its leg) • Antihelix (and its legs) • Triangular fossa • Scapha

  8. Note the legs of helix and antihelix

  9. Parts of the Outer Ear • Tragus • Antitragus • Intertragical notch • Anterior notch

  10. Note two flaps of Cartilage. One guarding ear hole *anterior is called “tragus” (goat) since it often begets a tuft of hair resembling a goat’s beard.

  11. Muscles of the Anterior Torso • Pectoralis major • originates along clavicle, sternum and rectus sheath • Inserts onto humerus • Rotates humerus inward and adducts the arm • note deltoid furrow between this and deltoid muscle

  12. Torso Muscles • Give support: connect to and move limbs • Help to flex the backbone • Protect internal organs • Strong core because fibers weave run in different directions (woven together)

  13. Muscles of the Anterior Torso • Pectoralis major “Pecs” • Draws arms forward and medially • Moves arm (pulls humerus) across chest: abducts/adducts • lower border does not align with thoracic arch.

  14. Muscles of the Anterior Torso • Rectus abdominis: “Washboard” • originates at pubic bone • inserts at xiphoid process and nearby costal cartilages

  15. Muscles of the Anterior Torso • Rectus abdominis • Primary function: Draws thorax downward and bends spine forward (allows back bone to flex) • Secondary function: holds in (retains) organs/provides strength to core

  16. Abdominal Aponeurosis • “Rectus Sheath” • Wide thin flat tendon that encases muscle (lies between surface of muscle and skin)

  17. Muscles of the Anterior Torso • External Oblique • named for oblique (diagonal) fibers and external placement • Rotates spine to opposite side • interlaces with serratus anterior • Flank Pad • bulge in external oblique over iliac crest • Surface landmark

  18. Muscles of the Anterior Torso • Serratus anterior • Located below armpit (axilla) on lateral side of chest • Originates along upper ribs. (several points of origin) • Inserts under scapula. • Weaves into External Obliques

  19. Muscles of the Anterior Torso • Serratus anterior • draws scapula laterally (downward) and anteriorly (forward) • Used when pushing something • When raising arms above horizontal level

  20. Muscles of the Anterior Torso • Serratus anterior interlaces with external oblique at origin, then disappears under latissimus dorsi (on back/posterior side).

  21. Other Structures • Linea alba • Transverse Lines: horizontal tendons divide R.A. into smaller portions, “six pack” • Umbilicus (navel)

  22. Sketch Assignments • Three mouth sketches (label one) • Three ear sketches (label one) • Three eye sketches (label one) • Three nose sketches (label one) • Different angles, different people if possible • Can be free-floating or all on three heads • Label structures covered in class

  23. Textbook Reference Pages • Peck, pp. 104, 160–161, 166 – 167, 170 – 173, 176 – 179 (view these pages primarily for the illustrations.)

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