Anatomy and Physiology for Clinical Aromatherapy Flashcards

How does the blood-brain barrier influence the therapeutic actions of essential oils on the central nervous system?

Answer: Lipophilic essential oil constituents can cross it, allowing direct CNS effects

Most essential oil constituents are small and lipophilic, properties that allow them to cross the blood-brain barrier and directly influence neurotransmitter activity and CNS function.

Which skin condition would MOST significantly reduce the topical absorption of essential oils applied by a clinical aromatherapist?

Answer: Severely thickened, hyperkeratotic skin (e.g., calluses)

Severely thickened hyperkeratotic skin creates an abnormally dense stratum corneum, presenting a substantially greater physical barrier to the penetration of essential oil molecules.

When aromatherapy activates the autonomic nervous system's parasympathetic branch, which physiological response is expected in a client?

Answer: Reduced heart rate, enhanced digestion, and relaxation

Parasympathetic (rest-and-digest) activation reduces heart rate, promotes peristalsis and digestion, and produces relaxation—effects associated with calming essential oils such as lavender.

Which anatomical structure acts as the primary gateway transmitting olfactory signals into the limbic system after leaving the nasal epithelium?

Answer: Olfactory bulb

The olfactory bulb receives signals directly from olfactory receptor neurons and projects them to limbic structures including the amygdala and piriform cortex, enabling emotional and memory responses to aromas.

Transdermal absorption of essential oil components is most significantly enhanced by applying oils to which type of skin site?

Answer: Areas with thin skin and high vascularity, such as the inner wrist or neck

Thin, well-vascularized skin (inner wrist, neck, behind the ears) offers less stratum corneum resistance and better local circulation, optimizing transdermal absorption of essential oil components.

The liver primarily metabolizes lipophilic essential oil constituents through which major enzyme system?

Answer: Cytochrome P450 (CYP450) enzyme system

The CYP450 enzyme system in hepatocytes is responsible for phase I oxidative metabolism of most lipophilic xenobiotics, including the terpenes and phenylpropanoids found in essential oils.

The calming effect of lavender essential oil on the nervous system is primarily mediated through which anatomical pathway?

Answer: Limbic system modulation via olfactory projections to the amygdala

Lavender's calming effects are primarily mediated through olfactory signals reaching the amygdala and related limbic structures that regulate emotional tone, anxiety, and stress responses.