Human Torso with Interchangeable Sex Organs, Muscles and Open Back, 23 Parts

Quick Answer: The human torso with interchangeable sex organs, muscles and open back, 23 parts, is an anatomy model that combines swappable male and female reproductive organs, modelled musculature and an opened back exposing the vertebral column and spinal cord. This 23 part torso model suits nursing, medical and senior biology courses that need more than the internal organs.

Three Features in One Torso

Interchangeable sex organs let one torso represent both a male and a female body: the pelvic region takes either a male or a female genital insert, so the reproductive system can be taught for both sexes without buying two models. Open back means the posterior surface is cut away to expose the vertebral column, the spinal cord and the roots of the spinal nerves, which a standard torso hides.

The word muscles indicates that part of the surface shows musculature rather than skin. On models of this type one side of the torso often displays superficial muscles such as pectoralis major, deltoid, sternocleidomastoid and the abdominal muscles, while the other side shows skin. How this model divides its surfaces, and which of the 23 parts are removable organs, is not set out in the title.

Compared with the 24 part torso with interchangeable sex organs, which does not list muscles or an open back, this version adds musculoskeletal content. The 27 part torso with muscles and open back has more parts but does not mention interchangeable genitals.

Specifications

Applications

• Teaching male and female reproductive anatomy with a single model
• Linking the spinal cord and vertebral column to the trunk organs in nursing courses
• Introducing superficial trunk and neck muscles in physiotherapy and sports science
• Whole-body revision in medical, nursing and senior biology classes

Care & Handling

• Store the unused genital insert of the 23 part torso model in a labelled bag with the torso so it is not lost.
• Remove organs in the order they are nested and keep them on a tray during lessons.
• Handle the open-back area with care, because the modelled spinal nerves are thin projections.
• Clean the painted muscle surfaces with a soft cloth only.

Why Choose LabEquip

Colleges that want a single torso to cover the organs, reproduction and the back often choose a combined model like this. It forms part of LabEquip’s biology lab products range; send the parts list you need through the contact page.

Frequently Asked Questions

What does interchangeable sex organs mean?

The torso has a pelvic insert that can be swapped between male and female reproductive organs. One model can therefore be used to teach both sexes, with the unused insert stored separately.

What does an open back show?

With the back cut away, students can see the vertebral column, the spinal cord inside the vertebral canal and the spinal nerves leaving between the vertebrae. This connects the organ systems to the central nervous system.

Which muscles are usually shown on a torso with muscles?

Typically the superficial muscles of the chest, shoulder, neck and abdominal wall, such as pectoralis major, deltoid, sternocleidomastoid, rectus abdominis and external oblique. The exact set varies between models.

How is this different from the 24 part and 27 part torsos?

The 24 part model has interchangeable sex organs but no stated muscles or open back. The 27 part model has muscles and an open back but no stated interchangeable genitals. This 23 part model is listed with all three features.

Is it suitable for school use?

Yes for senior secondary biology, especially where reproduction is taught. Teachers of younger classes may prefer a sexless torso, which has no genital inserts.

What does the part count include?

Part counts usually include the torso shell and every piece that comes out, such as each lung, the halves of the heart, the stomach, liver, intestines and the inserts. Two models with similar counts can divide their organs differently.

Last Updated: September 2026