Orbital septum

Sensory (Eye)

Orbitalis muscle

Sensory (Eye)

Orbitofrontal cortex

Nervous

Orbitosphenoid

Musculoskeletal

Orifice

Oronasal membrane

Respiratory

Oropharynx

Respiratory

Osseus cochlear canal

Sensory (Ear)

Osseus spiral lamina

Sensory (Ear)

Ossification center

Musculoskeletal

Osteoid

Musculoskeletal

Osteon

Musculoskeletal

Otic ganglion

Nervous

Outer canthus

Sensory (Eye)

Outer epithelial layer of tympanic membrane

Sensory (Ear)

Outer layer of endometrium

Reproductive

Outer limiting layer of retina

Sensory (Eye)

Outer medulla of kidney

Urinary

Outer nuclear layer of retina

Sensory (Eye)

Outer plexiform layer of retina

Sensory (Eye)

Outflow part of left atrium

Cardiovascular

Outflow part of left ventricle

Cardiovascular

Outflow part of right atrium

Cardiovascular

Outflow part of right ventricle

Cardiovascular

Outflow tract of atrium

Cardiovascular

Outflow tract of ventricle

Cardiovascular

Oval window

Sensory (Ear)

Ovarian artery

Cardiovascular

Ovarian cortex

Reproductive

Ovarian follicles

Reproductive

Ovarian ligament

Reproductive

Ovarian medulla

Reproductive

Ovarian vein

Cardiovascular

Ovaries

Reproductive

Ovary stroma

Reproductive

Oviduct mucosal fold

Reproductive

Pacinian corpuscle

Integumentary

Palatal muscle

Digestive

Palatine aponeurosis

Digestive

Palatine bone

Digestive

Palatine bone horizontal plate

Digestive

Palatine gland

Digestive

Palatine process of maxilla

Digestive

Palatine raphe

Digestive

Palatine tonsil

Respiratory

Palatine torus

Digestive

Palatine uvula

Digestive

Palatoethmoidal suture

Musculoskeletal

Palatoglossal arch

Digestive

Palatoglossus muscle

Digestive

Palatomaxillary suture

Musculoskeletal

Palatopharyngeus muscle

Respiratory

Paleocortex

Nervous

Pallidum

Nervous

Palmar branch of median nerve

Nervous

Palmar digital vein

Cardiovascular

Palmar interosseous muscle of manus

Muscular

Palmaris brevis

Muscular

Palmaris longus muscle

Muscular

Palpebral conjunctiva

Sensory (Eye)

Palpebral fissure

Sensory (Eye)

Palpebral lobe of lacrimal gland

Palpebral vein

Cardiovascular

Pancreas

Digestive

Pancreatic acinus

Digestive

Pancreatic duct

Digestive

Pancreatic islets

Endocrine

Pancreatic lobule

Digestive

Pancreatic lymph node

Immune/Lymphatic

Pancreatic tributary of splenic vein

Cardiovascular

Pancreaticoduodenal vein

Cardiovascular

Pancreaticosplenic lymph node

Immune/Lymphatic

Papillary layer of dermis

Integumentary

Papillary muscle of heart

Cardiovascular

Papillary muscle of left ventricle

Cardiovascular

Papillary muscle of right ventricle

Cardiovascular

Paraaortic body

Endocrine

Paraaortic lymph node

Immune/Lymphatic

Parabigeminal nucleus

Nervous

Parabrachial pigmental nucleus

Nervous

Paracardial gastric lymph node

Immune/Lymphatic

Paracentral lobule

Nervous

Paracentral nucleus

Nervous

Paradidymis

Reproductive

Parafollicular cells (C cells)

Endocrine

Paraganglion (generic)

Parahippocampal gyrus

Nervous

Parakeratinized epithelium of tongue

Digestive

Paramedian lobule

Nervous

Paramedian reticular nucleus

Nervous

Parametrium

Reproductive

Paranasal sinuses

Respiratory

Pararenal fat

Parasternal lymph node

Immune/Lymphatic

Parasubiculum

Nervous

Parasympathetic ganglion

Nervous

Parasympathetic nervous system

Nervous

Paratenial nucleus

Nervous

Paraterminal gyrus

Nervous

Parathyroid chief cells

Endocrine