frontal bone

bone (bōn)

1. the hard, rigid form of connective tissue constituting most of the skeleton of vertebrates, composed chiefly of calcium salts.

2. any distinct piece of the skeleton of the body.

---

ankle bone  talus.

basiotic bone  a small bone in the fetus between the basilar process and the basisphenoid.

brittle bones  osteogenesis imperfecta.

cancellous bone  see lamellar b.

capitate bone  the bone in the distal row of carpal bones lying between the trapezoid and hamate bones.

carpal bones  the eight bones of the wrist (carpus), including the capitate, hamate, lunate, pisiform, scaphoid, trapezoid, and triquetral bones and the trapezium.

cartilage bone  bone developing within cartilage, ossification taking place within a cartilage model.

cheek bone  zygomatic b.

collar bone  clavicle.

compact bone  see lamellar b.

cortical bone  the compact bone of the shaft of a bone that surrounds the marrow cavity.

cuboid bone  a bone on the lateral side of the tarsus between the calcaneus and the fourth and fifth metatarsal bones.

cuneiform bone, intermediate  the intermediate and smallest of the three wedge-shaped tarsal bones located medial to the cuboid and between the navicular and the first three metatarsal bones.

cuneiform bone, lateral  the most lateral of the three wedge-shaped tarsal bones located medial to the cuboid and between the navicular and the first three metatarsal bones.

cuneiform bone, medial  the medial and largest of the three wedge-shaped tarsal bones located medial to the cuboid and between the navicular and the first three metatarsal bones.

ethmoid bone  the cubical bone located between the orbits and consisting of the lamina cribrosa, the lamina perpendicularis, and the paired lateral masses.

flat bone  one whose thickness is slight, sometimes consisting of only a thin layer of compact bone, or of two layers with intervening cancellous bone and marrow; usually curved rather than flat.

frontal bone  a single bone that closes the anterior part of the cranial cavity and forms the skeleton of the forehead; it is developed from two halves, the line of separation (the frontal suture) sometimes persisting in adult life.

funny bone  the region of the median condyle of the humerus where it is crossed by the ulnar nerve.

hamate bone  the medial bone in the distal row of carpal bones.

heel bone  calcaneus.

hip bone  the large bone in the hip, consisting of the ilium, the ischium, and the pubic bone.

hyoid bone  a horseshoe-shaped bone at the base of the tongue, just superior to the thyroid cartilage.

incisive bone  the portion of the maxilla bearing the incisors; developmentally, it is the premaxilla, which in humans later fuses with the maxilla, but in most other vertebrates persists as a separate bone.

innominate bone  hip b.

jaw bone  the mandible or maxilla, especially the mandible.

jugal bone  zygomatic b.

lacrimal bone  a thin scalelike bone at the anterior part of the medial wall of the orbit, articulating with the frontal and ethmoid bones and the maxilla and inferior nasal concha.

lamellar bone  the normal type of adult bone, organized in layers (lamellae), which may be parallel (cancellous b.) or concentrically arranged (compact b.).

lingual bone  hyoid b.

long bone  a bone that has a longitudinal axis of considerable length, consisting of a body or shaft (the diaphysis) and an expanded portion (the epiphysis) at each end that is usually articular; typically found in the limbs.

lunate bone  the bone in the proximal row of carpal bones lying between the scaphoid and triquetral bones.

malar bone  zygomatic b.

marble bones  osteopetrosis.

mastoid bone  mastoid part of temporal bone; see under part.

metacarpal bones  the five cylindrical bones of the hand (metacarpals), which articulate proximally with the bones of the wrist and distally with the proximal phalanges of the fingers; numbered from that articulating with the phalanx of the thumb to that articulating with the phalanx of the little finger.

metatarsal bones  the five bones (metatarsals) extending from the ankle to the phalanges of the toes; numbered from the most medial articulating with the phalanx of the big toe to the most lateral articulating with the phalanx of the little toe.

nasal bone  either of the two small, oblong bones that together form the bridge of the nose.

navicular bone  the oval-shaped tarsal bone found between the talus and the three cuneiform bones.

occipital bone  a single trapezoid-shaped bone at the posterior inferior part of the cranium, articulating with the two parietal and two temporal bones, the sphenoid bone, and the atlas; it contains a large opening, the foramen magnum.

palatine bone  the irregularly shaped bone forming the posterior part of the hard palate, the lateral wall of the nasal fossa between the medial pterygoid plate and the maxilla, and the posterior part of the floor of the orbit.

parietal bone  either of the two quadrilateral bones forming part of the superior and lateral surfaces of the skull, and joining each other in the midline at the sagittal suture.

pelvic bone  hip b.

petrous bone  petrous part of temporal bone; see under part.

pisiform bone  the medial bone of the proximal row of carpal bones.

pneumatic bone  bone that contains air-filled spaces.

premaxillary bone  premaxilla.

pterygoid bone  see under process.

pubic bone  the anterior inferior part of the hip bone on either side, articulating with its fellow in the anterior midline at the pubic symphysis; it is a separate bone in early life.

rider's bone  localized ossification of the inner aspect of the lower end of the tendon of the adductor muscle of the thigh; sometimes seen in horseback riders.

semilunar bone  lunate b.

sesamoid bones  numerous ovoid nodular bones, often small, usually found embedded within a tendon or joint capsule, principally in the hands and feet; two sesamoid bones, the fabella and patella, are associated with the knee.

shin bone  tibia.

sphenoid bone  a single irregular, wedge-shaped bone at the base of the skull, forming part of the floor of the anterior, middle, and posterior cranial fossae.

squamous bone  squamous part of temporal bone; see under part.

sutural bone  variable and irregularly shaped bones in the sutures between the bones of the skull.

tail bone  coccyx.

tarsal bones  the seven bones of the ankle (tarsus), including the calcaneus, the cuboid bone, the navicular bone, the talus, and the intermediate, lateral, and medial cuneiform bones.

temporal bone  either of the two irregular bones forming part of the lateral surfaces and base of the skull, and containing the organs of hearing. It is divided anatomically into four parts: the mastoid, petrous, squamous, and tympanic parts.

thigh bone  femur.

trapezoid bone  the bone in the distal row of carpal bones lying between the trapezium and the capitate bone.

triquetral bone  the bone in the proximal row of carpal bones lying between the lunate and pisiform bones.

turbinate bone  any of the nasal conchae.

tympanic bone  tympanic part of temporal bone; see under part.

unciform bone , uncinate bone hamate b.

wormian bone  sutural bone.

zygomatic bone  the quadrangular bone of the cheek, articulating with the frontal bone, the maxilla, the zygomatic process of the temporal bone, and the greater wing of the sphenoid bone.

---

frontal bone

n.

A cranial bone consisting of a vertical portion corresponding to the forehead and a horizontal portion that forms the roofs of the orbital and nasal cavities.

---

frontal bone

[fron′təl]

Etymology: L, frons, forehead

a single cranial bone that forms the front of the skull, from above the orbits, posteriorly to a junction with the parietal bones at the coronal suture and sagittal suture (bregma).

Frontal bone

---

frontal bone,

n portion of the skull composed of two parts: the squama, or vertical piece, which forms the forehead, and the horizontal portion, which forms spaces for the eyes and nasal passages.

Frontal bone.

---

frontal bone,

n a single cranial bone that forms the front of the skull from above the orbits posteriorly to a junction with the parietal bones at the coronal suture.

---

frontal

1. pertaining to the face and forehead.

2. denoting a plane passing through the body from side to side. In quadrupeds it is synonymous with a transverse plane while in bipeds it is synonymous with a coronal plane.

---

frontal abscess

in cattle usually results from infection of a dehorning wound, in sheep from infection by Oestrus ovis.

frontal bone

the paired bones constituting the upper part of the face. See also Table 10.

frontal lobe

the rostral (anterior) portion of the cerebral hemisphere.

frontal nerve block

see supraorbital nerve block.

frontal plane

see dorsal plane.

frontal process

see comb.

frontal sinus

see frontal sinus.

frontal sinusitis

inflammation of the frontal sinus; commonly a sequel to infection of a dehorning wound. Occurs as a chronic disease of unknown origin in bighorn sheep running at range in the wild.