Club-shaped mesenchymal gland cells, opening externally, generally are present in all flatworms.
These are branching cuticle-lined tubules opening externally through the spiracles and terminating internally in the blood, or organ tissues (Barnes et al. 2001).
In insects, oxygen is delivered to cells through a highly branched system, called tracheae, which open externally in valve-like structures responsible to control gas exchange.
In all other birds, the nostrils open externally close to the base of the bill, or internally in the roof of the mouth.
Italy is one of the few Western European countries that mainly use open, externally vented glass or semi-rigid infusion containers.
During experiments, the effusion orifice is externally opened for direct mass spectrometric measurements of saturated vapour pressures.
After fixation in formalin, the eyes were examined externally, opened horizontally in the pupil-optic nerve plane and the superior calotte removed.
The development and refinement of our annotation tools, which is discussed in the following section, led to their use externally and hence opened up the possibility of external community annotation.
Viewed from afar, they are all open, successful, externally orientated.
L-homoserine (LHS) treated siliques have predominantly uninfected pericarps, but some externally uninfected LHS treated siliques revealed, when opened, the presence of fungal colonisation within the silique (far right).
