The prostate gland and bulbourethral glands are glands of the male reproductive system which contribute secretions to seminal fluid. The ductus, or vas, deferens is a duct of the male reproductive system which opens into the urethra. The vestibule, however, is a part of the female reproductive system. It is an entrance of the vagina between the labia minora and has the hymen at the vaginal orifice.

Normal fertilization occurs in the ampulla of the fallopian tube (the wider region). The ovaries produce oocytes (eggs), one of which is released per month to be fertilized. If the egg is fertilized, it then travels to and embeds in the uterus, where it develops as a fetus. The vagina receives the penis and semen during sexual intercourse and later provides a passage for delivery of an infant.

The sulci, or folds, of the brain help to compartmentalize activity and increase surface area. The central sulcus runs along the coronal plane, from right to left across the surface of the brain. The frontal lobe is anterior to the sulcus and the parietal lobe is posterior to the sulcus.

The lateral sulcus separates the parietal lobe and temporal lobe. The parietooccipital sulcus separates the parietal and occipital lobes.

The meninges are responsible for protecting the brain and spinal cord. The tough dura mater is the outermost layer of the meninges, while the pia mater is the delicate inner layer that lines the brain and spinal cord.

In order from the outermost to innermost layer, the meninges are: dura mater, arachnoid mater, subarachnoid space, and pia mater. The arachnoid mater and subarachnoid space create separation and cushioning between the dura mater and pia mater.

The temporal lobe is responsible for the interpretation of auditory stimuli. It also holds the hippocampus, a structure responsible for the formation and storage of memories.

The occipital lobe houses the visual cortex and the parietal lobe contains the somatosensory cortex (touch). The frontal lobe houses the motor cortex and functions in voluntary movement and conscious thought.

The meninges consist of three layers of connective tissue that surround the central nervous system. Dura mater is the thick outermost layer and serves to partition the central nervous system and meninges from the rest of the body. Arachnoid mater is the loose middle layer with a web-like appearance and helps cushion and protect the central nervous system. The subarachnoid space exists between the arachnoid and pia mater and is filled with cerebrospinal fluid. Pia mater is the delicate inner layer that adheres to the surface of the brain and spinal cord, creating one final barrier.

The nervous system can be separated into the central and peripheral divisions. The central nervous system houses the brain and spinal cord, while the peripheral nervous system contains all offshoots of the spinal cord.

The brain contains several structure and serves as the point of origin for the twelve cranial nerves. The globus pallidus is a subcortical structure in the brain. The olfactory (CNI) and optic nerves (CNII) are located exclusively within the brain, never actually deviating into the periphery. These are the only cranial nerves considered to be part of the central nervous system. The meninges are the layers of connective tissue that surround the spinal cord and brain, creating the blood-brain barrier. The meninges include the dura mater, arachnoid mater, and pia mater and are considered part of the central nervous system.

The oculomotor nerve is the third cranial nerve (CNIII), and is considered part of the peripheral nervous system.

The structure that connects the brain is called the corpus callosum. The medulla and cerebellum are part of the midbrain and hindbrain respectively. The infundibulum is the stalk of the pituitary gland.

The amygdala is the center of emotions in the brain. The hippocampus is an area of learning and memory. The cerebellum is related to coordination of muscle activity. The medulla is for homeostasis of vital body functions.

The occipital lobe is devoted to vision. It is located on the posterior aspect of the brain. Compared to the other three primary lobes it has very few jobs. Similar to temporal lobe which makes sense of auditory stimuli (amongst other things) and the parietal lobe which processes touch sensations, temperature etc., the occipital lobe allows us to process what we see. The cerebellum is not a primary lobe of the brain, and it functions in coordinating motor movements such as walking and playing the guitar.