1
Adenoid
Tonsilla pharyngea
A mass of lymphoid tissue at the back of the nasal cavity that helps catch inhaled germs in childhood.
Below are body parts that contain the letter O anywhere in the name. Each of the 55 body parts below opens to a full profile.
Table of contents
List of Body Parts That Contain O
2
Alveoli
Alveoli pulmonis
Microscopic air sacs at the end of the bronchioles where gas exchange between air and blood takes place.
3
Aorta
Aorta
The largest artery in the body, carrying oxygen-rich blood from the heart's left ventricle to the rest of the body.
4
Aortic Bulb
Bulbus aortae
The dilated base of the ascending aorta just above the aortic valve, containing the openings of the coronary arteries.
5
6
Buttock
Nates
One of the two rounded fleshy mounds on the back of the pelvis, formed mostly by the gluteal muscles.
7
Carotid Artery
Arteria carotis
A pair of major arteries in the neck that supply blood to the brain, face, and neck tissues.
8
Cornu
Cornu
An anatomical term for a horn-shaped projection, used for several structures including the cornua of the hyoid bone and the uterus.
9
Deltoid
Musculus deltoideus
A triangular muscle that caps the shoulder and produces most arm-lifting movements.
10
Duodenum
Duodenum
The first and shortest section of the small intestine, where stomach contents mix with digestive juices from the pancreas and liver.
11
Elbow
Articulatio cubiti
The hinge joint of the upper limb where the humerus meets the radius and ulna.
12
Epiglottis
Epiglottis
A leaf-shaped cartilaginous flap at the back of the tongue that covers the airway during swallowing.
13
14
Ethmoid Bone
Os ethmoidale
A delicate central bone of the skull base that contributes to the eye sockets, nasal cavity, and nasal septum.
15
Eyebrow
Supercilium
A strip of short hair above each eye that shields the eye from sweat and contributes to facial expression.
16
Foot
Pes
The flexible base of the lower limb, made up of 26 bones, that supports the body's weight and propels it during walking.
17
18
Hippocampus
Hippocampus
A seahorse-shaped brain structure deep in the temporal lobe that is essential for forming new memories.
19
Hyoid Bone
Os hyoideum
A small U-shaped bone in the upper neck that anchors the tongue and several throat muscles without articulating with any other bone.
20
Hypothalamus
Hypothalamus
A small region at the base of the brain that controls hormone release, body temperature, hunger, and many basic drives.
21
Incisor
Dens incisivus
A flat, chisel-shaped tooth at the front of the mouth used for biting and cutting food.
22
Jugular Foramen
Foramen jugulare
A large opening at the base of the skull through which several cranial nerves and the internal jugular vein exit the cranial cavity.
23
Mouth
Cavitas oris
The oral cavity, the entry point of the digestive tract where food is taken in, chewed, and mixed with saliva.
24
Nephron
Nephronum
The microscopic functional unit of the kidney, where blood is filtered and urine is fine-tuned.
25
Nostril
Naris
One of the two external openings of the nose through which air enters the respiratory tract.
26
Occipital Bone
Os occipitale
The single bone at the back and base of the skull that surrounds the foramen magnum where the spinal cord exits.
27
Olfactory Bulb
Bulbus olfactorius
A small forebrain structure at the front of the brain that processes incoming signals about smell.
28
Optic Disc
Discus nervi optici
A small circular area on the retina where the optic nerve fibers leave the eye and blood vessels enter.
29
Optic Nerve
Nervus opticus
The cranial nerve that carries visual information from the retina to the brain.
30
Ovary
Ovarium
A paired female reproductive gland that produces eggs and secretes the hormones estrogen and progesterone.
31
Pulmonary Artery
Arteria pulmonalis
A short, large vessel that carries deoxygenated blood from the right ventricle to the lungs.
32
Quadratus Femoris
Musculus quadratus femoris
A short, flat muscle of the hip that rotates the thigh outward and helps stabilize the hip joint.
33
Quadratus Lumborum
Musculus quadratus lumborum
A deep muscle of the posterior abdominal wall that stabilizes the lower spine and helps bend the trunk sideways.
34
Red Marrow
Medulla ossium rubra
The blood-cell-producing tissue inside many bones, where new red cells, white cells, and platelets are made throughout life.
35
Rotator Cuff
Musculi rotatores
A group of four muscles and their tendons that surround the shoulder joint and keep the head of the humerus seated in the socket.
36
Spinal Cord
Medulla spinalis
The long bundle of nerve fibers and cell bodies running down through the vertebral column from the brainstem.
37
Stomach
Ventriculus
A J-shaped muscular sac that stores swallowed food and begins protein digestion through acid and enzymes.
38
Thyroid Gland
Glandula thyroidea
A butterfly-shaped endocrine gland in the front of the neck that controls metabolism through its hormones.
39
Tongue
Lingua
A muscular organ in the mouth that handles food during chewing and swallowing and supports taste and speech.
40
Umbilical Cord
Funiculus umbilicalis
A flexible tube connecting the developing fetus to the placenta, carrying blood between the two.
41
Vocal Cord
Plica vocalis
One of a pair of folds of mucous membrane in the larynx that vibrate to produce sound during speech and singing.
42
White Blood Cells
Leucocyti
A family of immune cells circulating in the blood that defend the body against infection and injury.
43
Wisdom Tooth
Dens serotinus
The third molar at the very back of each side of the jaw, usually the last permanent tooth to erupt in early adulthood.
44
X Chromosome
Chromosoma X
A sex chromosome found in all human cells, present as two copies in genetic females and one copy in genetic males.
45
Xiphoid Cartilage
The cartilaginous tip of the xiphoid process in young people, before it ossifies, providing flexibility at the inferior sternum.
46
Xiphoid Process
Processus xiphoideus
A small cartilaginous extension at the lower end of the sternum that serves as an attachment point for several muscles and ligaments.
47
Y Chromosome
Chromosoma Y
The smaller of the two sex chromosomes, found only in genetic males and carrying the master switch for male sex determination.
48
Yellow Bone Marrow
Medulla ossium flava
A fatty tissue found in the central cavities of long bones, serving as an energy reserve and a backup site for blood cell production.
49
Yolk Sac
Saccus vitellinus
An early embryonic membrane that provides nutrients and the first blood cells before the placenta takes over.
50
Zona Fasciculata
Zona fasciculata
The middle and largest layer of the adrenal cortex, producing cortisol and other glucocorticoid hormones.
51
Zona Glomerulosa
Zona glomerulosa
The outermost layer of the adrenal cortex, producing aldosterone to regulate sodium balance and blood pressure.
52
Zona Reticularis
Zona reticularis
The innermost layer of the adrenal cortex, producing weak androgens that supplement gonadal sex hormones.
53
Zygomatic Arch
Arcus zygomaticus
The bony arch on the side of the face formed by the temporal and zygomatic bones, visible as the upper cheek ridge.
54
Zygomatic Bone
Os zygomaticum
The cheekbone, a paired bone that forms the prominence of the cheek and the lateral wall of the eye socket.
55
Zygomaticus Major
Musculus zygomaticus major
A facial muscle that draws the corner of the mouth upward and outward, producing the characteristic action of smiling.
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