Chapter Seven The Skeletal System: Axial Skeleton 127 INTEGRATE EXERCISE 7.1D Th

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Chapter Seven The Skeletal System: Axial Skeleton 127 INTEGRATE EXERCISE 7.1D The Mandible 1. Obtain an isolated mandible or observe the mandsble on CONCEPT CONNECTION The nasal cavity plays an important role in respiration and olfaction the sense of smell). The role of the nasal cavity in respiration is to moisten, filter, and warm the air before it emters lower respiratory structures. The role of the nasal cavity in olfaction is to house the olfactory epithelium, which is responsible for detecting odorants in the air, Olfactory receptor cells ere embedded within this epithelium, and their nerve processes project through the foramina of the crib riform plate of the ethmoid bone to reach the olfactory nerve. This pathway relays sensory input regarding the sense of smell to the brain. As odorants enter the nasal cavity, they dissolve in mucus in the nssal cavity, then bind to receptors on olfactory "hairs," thereby exciting these sensory neurons, Nerve signals, or action potentials, are then transmitted along the ofactory nerves to the olfactory bulb. From there, the signals are transmitted to the brain for the conscious perception of smell. This process wil be revisited in chapter 13 in the discussion of special senses. an articulated skeleton or complete skull 2·The mandible (figure 7.4) is unique among skull bones, because it is the only bone that is movable. It shares an articulation with the temporal bone, forming the temporomandibular joint. Here, the head of the mandible articulates with the mandibular fossa of the temporal bone. The mandibular condyle is the rounded projection on the head of the mandible that actually forms the joint with the temporal bone. Place your fingers just anterior to your ears and then open and close your mouth to feel the movement of the joint formed between the mandible and temporal bone (the temporomandibular joint). 3-The mandible also has a prominent coronoid process (corona, crown, + eidos, form, resemblance) that serves as the insertion point for the temporalis muscle Figure 7.4 The Mandible. Lateral view -ental foramen coronoid process head of mandible mandibular foramen mandibular natch alveolar process mental protuberance angle condylar process

Explanation / Answer

The Mandible :

1) Head of mandible

2) Coronoid process

3) Mandibular notch

4) Condylar process

5) Mandibular notch

6) Mylohyoid line

7) Ramus

8) Alveolar process

9) Mental foramen

10) Angle

11) Body

12) Mental Protuberance

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