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| 61. | inferior nasal concha | one of the paired bones that project from the lateral walls of the nasal cavity to form the largest and most inferior of the nasal conchae |
| 62. | infraorbital foramen | opening located on anterior skull, below the orbit |
| 63. | infratemporal fossa | space on lateral side of skull, below the level of the zygomatic arch and deep (medial) to the ramus of the mandible |
| 64. | internal acoustic meatus | opening into petrous ridge, located on the lateral wall of the posterior cranial fossa |
| 65. | intervertebral disc | structure located between the bodies of adjacent vertebrae that strongly joins the vertebrae; provides padding, weight bearing ability, and enables vertebral column movements |
| 66. | intervertebral foramen | opening located between adjacent vertebrae for exit of a spinal nerve |
| 67. | jugular (suprasternal) notch | shallow notch located on superior surface of sternal manubrium |
| 68. | jugular foramen | irregularly shaped opening located in the lateral floor of the posterior cranial cavity |
| 69. | kyphosis | (also, humpback or hunchback) excessive posterior curvature of the thoracic vertebral column region |
| 70. | lacrimal bone | paired bones that contribute to the anterior-medial wall of each orbit |
| 71. | lacrimal fossa | shallow depression in the anterior-medial wall of the orbit, formed by the lacrimal bone that gives rise to the nasolacrimal canal |
| 72. | lambdoid suture | inverted V-shaped joint that unites the occipital bone to the right and left parietal bones on the posterior skull |
| 73. | lamina | portion of the vertebral arch on each vertebra that extends between the transverse and spinous process |
| 74. | lateral pterygoid plate | paired, flattened bony projections of the sphenoid bone located on the inferior skull, lateral to the medial pterygoid plate lateral sacral crest paired irregular ridges running down the lateral sides of the posterior sacrum that was formed by the fusion of the transverse processes from the five sacral vertebrae |
| 75. | lesser wings of the sphenoid bone | lateral extensions of the sphenoid bone that form the bony lip separating the anterior and middle cranial fossae |
| 76. | ligamentum flavum | series of short ligaments that unite the lamina of adjacent vertebrae |
| 77. | lingula | small flap of bone located on the inner (medial) surface of mandibular ramus, next to the mandibular foramen |
| 78. | lordosis | (also, swayback) excessive anterior curvature of the lumbar vertebral column region |
| 79. | lumbar curve | posteriorly concave curvature of the lumbar vertebral column region; a secondary curve of the vertebral column |
| 80. | lumbar vertebrae | five vertebrae numbered as L1L5 that are located in lumbar region (lower back) of the vertebral column |
| 81. | mandible | unpaired bone that forms the lower jaw bone; the only moveable bone of the skull |
| 82. | mandibular foramen | opening located on the inner (medial) surface of the mandibular ramus |
| 83. | mandibular fossa | oval depression located on the inferior surface of the skull |
| 84. | mandibular notch | large U-shaped notch located between the condylar process and coronoid process of the mandible |
| 85. | manubrium | expanded, superior portion of the sternum |
| 86. | mastoid process | large bony prominence on the inferior, lateral skull, just behind the earlobe |
| 87. | maxillary bone | (also, maxilla) paired bones that form the upper jaw and anterior portion of the hard palate |
| 88. | maxillary sinus | air-filled space located with each maxillary bone; largest of the paranasal sinuses |
| 89. | medial pterygoid plate | paired, flattened bony projections of the sphenoid bone located on the inferior skull medial to the lateral pterygoid plate; form the posterior portion of the nasal cavity lateral wall |
| 90. | median sacral crest | irregular ridge running down the midline of the posterior sacrum that was formed from the fusion of the spinous processes of the five sacral vertebrae |
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