Osteology I - Axial STUDENT_updated June 2023(2)

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University of Arkansas *

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Biology

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Dec 6, 2023

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YOUR NAME: Isabella Sanchez LAB SECTION: 3 Human Osteology I – Axial Skeleton Objectives: After the lab, you should be able to: Identify the major bones of the human body by name, location, and shape. Describe the different types of human teeth and how they function. Identify the anatomical planes of the body. Correctly orient the body in standard anatomical position. Locate the major muscles of mastication. Describe the types of motion that occur at joints between bones. To become familiar with the methods biological and forensic anthropologists use to identify an individual's sex by looking at skeletal remains (skull and pelvic girdle). Station 1. The Skull Instructions: Examine the skull at this station noting that the skull is made up of many bones joined by sutures. 1. Which bones make up the cranial vault (bones surrounding the brain)? Frontal, Parietal, Temporal, Occipital, Sphenoid, and the Ethmoid 2. Which bones make up the face? Mandible, Maxilla, Frontal bone, Nasal bones, and Zygoma 3. For each of the following bones, identify whether the bone is paired or singular: Maxilla Paired Zygomatic Paired Mandible Singular Frontal Singular Parietal Paired Temporal Paired Occipital Singular Sphenoid Singular 4. Name the bones that articulate (come together) at each of the following sutures. 1
Coronal Frontal and Parietal Sagittal Parietal Temporal Occipital, Parietal, and Ethmoid Lambdoidal Parietal and Occipital 5. Locate the foramen magnum. 5a. On what bone is the foramen magnum located? Occipital 5b. What soft-tissue feature passes through the foramen magnum? The spinal cord 6. Which two bones make up the zygomatic arch? Temporalis and Zygomatic 7. The temporalis muscle, a muscle of mastication, originates from the cranium and inserts on the mandible. 7a. List the bones to which the temporalis muscle attaches on the side of the cranium. The temporalis muscle attaches to the temporal line on the parietal bone and goes under the zygomatic arch. 7b. What is the name of the raised ridge of bone that demarcates the superior and posterior limit of the temporalis’ origin? Temporal line 7c. The temporalis muscle travels beneath the zygomatic arch, through a space called the temporal foramen. Some species have a large temporal foramen, while other species have a smaller temporal foramen. What can you infer about the size (and therefore strength) of the temporalis muscle? Would a larger temporalis be found in species with softer diets or in species that eat hard/tough items? If smaller then weaker, and if bigger then stronger. A larger one would be found in species that eat hard/tough items. 8. To what bones does the masseter muscle attach? It attaches to the outside of the zygomatic arch and wraps a little bit under the bottom of mandible 2
Station 2. The Dentition 1. Compare and contrast the shape of each of the types of teeth listed below. For example, count the number of cusps (points) on each tooth type. Does each type have cusps? Does the number of cusps differ between the maxillary (upper) and mandibular (lower) dentition? Incisor: No cusp Canine: 1 cusp Premolar : 2 cusps Molar: 3-5 cusps 2. Which bones anchor the teeth? Alveolar bones 3. Briefly describe how you use your incisors to acquire and process food. They are for cutting and chopping food 4. Briefly describe how you use your premolars and molars to acquire and process food. They are for mashing, grinding, and breaking up food 5. A dental formula describes the number and types of teeth found in the maxilla and mandible. To calculate the dental formula, count up the number of incisors, canines, premolars, and molars in each half of the maxilla and mandible at write it like this (#maxillary incisors: # maxillary canines: number of maxillary premolars: number of maxillary molars/#mandibular incisors: # mandibular canines: number of mandibular premolars: number of mandibular molars). For example, for a capuchin monkey the dental formula is 2:1:3:3/2:1:3:3 5a. What is the adult human dental formula? 2:1:2:3/2:1:2:3 5b. What is the dental formula for an adult chimpanzee? 2:1:2:3 5c. How do the canines of chimpanzees and gorillas differ from that of a human? The canines of a gorilla or a chimpanzee are way larger than a human. 5d. What is the dental formula for this monkey? 2:2:2:3 3
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